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Physics Questions and Answers October 30, 2019

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If the magnetic flux through this surface has a magnitude of 5 . 2 1 0 5 T m 2 T m 2 , what is the strength of the magnetic field

What is the linear speed of the 0 . 0 6 0 0 kgkg sphere as its passes through its lowest point?

Each element of a series, an inductor, a resistor, and capacitor in an LRC circuit the voltage and current are a . ) in phase b . ) not in phase c . ) voltage is in phase d . ) current is in phase e . ) current is not in phase

1 3 . ( 1 4 points ) The Nittany Lion has been thrust into an alternate universe, where the force of gravity is radial, attractive, and has the magnitude F = F 0 m + G 0 m 1 m 2 sinr r r 0 and F = 0 when r > r 0 m 0 r 0 where F 0 = 4 . 3 2 1 0 6 dynes, r 0 = 1 2 , 4 0 2 AU , m 0 = 4 . 7 2 1 0 4 g , and G 0 = 8 . 5 2 1 0 1 8 dynes g 2 . The

Question # 0 5 ( 2 0 ) A DC shunt generator ( 2 0 kW , 2 0 0 V , 1 8 0 0 rpm ) has Ra = 0 . 1 R _ a = 0 . 1 \ , \ OmegaRa = 0 . 1 , Rw = 1 5 0 R _ w = 1 5 0 \ , \ OmegaRw = 1 5 0 . Assume that Ea = VtE _ a = V _ tEa = Vt at no load. Data for the magnetization curve at 1 8 0 0 rpm are: IfI _ fIf ( A ) 0 . 0 0 . 1 2 5 0 . 2 5 0 . 5 0 . 6 2 5 0 . 7 5

What is the total energy density in an electromagnetic wave of intensity 1 7 0 0 W / m ^ 2 ?

Chapter 2 5 HW ( 1 0 points total ) Name: A helium - neon laser emits a beam of unpolarized light that passes through three Polaroid filters, as shown in the figure. The intensity of the laser beam is \ ( \ mathrm { I } _ { 0 } \ ) . ( a ) What is the intensity of the beam at point \ ( A \ ) ? ( b ) What is the intensity of the beam at point \ ( B
Chapter 2 5 HW ( 1 0 points total ) Name: A

3 . Explain in a few sentences, with a focus on the physics, what is meant by "nucleate boiling suppression" in flow boiling? [ 5 ]
3 . Explain in a few sentences, with a focus on

ASK YOUR TEACHER n d = 3 2 . 0 m away from a burning building directs a stream of water from a ground - level fire hose at an angle of i = 2 7 . 0 above the horizontal as shown in the figure. If the speed of the stream as it e hose is v i = 4 0 . 0 m s , at what height will the stream of water strike the building? m
ASK YOUR TEACHER n d = 3 2 . 0 m away from a

hw 1 6 rotational kinematics, rotational inertia, torque.

A 1 1 0 AA current circulates around a 2 . 3 0 - mmmm - diameter superconducting ring. Part A What is the ring's magnetic dipole moment? Express your answer in amper - meters squared with the appropriate units. View Available Hint ( s ) for Part A Activate to select the appropriates template from the following choices. Operate up and down arrow

An electromagnetic wave with frequency 6 5 . 0 Hztravels in an insulating magnetic material that has dielectric constant 3 . 6 4 and relative permeability 5 . 1 8 at this frequency. The electric field has amplitude 7 . 2 0 1 0 3 V / m .

A thin film of oil ( n = 1 . 4 1 ) of thickness 4 3 4 nm with air on both sides is illuminated with white light at normal incidence. Determine the most strongly and the most weakly reflected wavelengths in the range 3 2 9 nm to 4 3 2 nm . ( Enter your answers in nm . ) HINT ( a ) the most strongly reflected nm ( b ) the most weakly reflected nm
A thin film of oil ( n = 1 . 4 1 ) of thickness 4

The plane of a conducting loop is oriented parallel to the x - y plane . A magnetic field is directed in the z direction . Which one of the following actions will not change the magnetic flux through the loop?

A scale used to weigh fish consists of a spring hung from a support. The spring's equilibrium length is 1 0 . 0 cm . When a 4 . 0 kg fish is suspended from the end of the spring, it stretches to a length of 1 2 . 6 cm .
A scale used to weigh fish consists of a spring

Suppose you are given a 1 3 5 V motor that draws 5 . 5 A at its normal ( steady - state ) speed, but 1 8 A when it first starts: Randomized Variables I 0 = 1 8 A I = 5 . 5 A V = 1 3 5 V

A 6 . 0 - cm - diameter, 1 0 - cm - long cylinder contains 1 0 0 mg of oxygen ( O 2 ) at a pressure less than 1 atm. The cap on one end of the cylinder is held in place only by the pressure of the air. One day when the atmospheric pressure is 1 0 0 kPa, it takes a 1 7 7 N force to pull the cap off.

In what way does the speed of light limit the possibility of interstellar travel?

Air conduction can be performed using either insert earphones or

The photo below shows a sealed Ball jar with vacuum inside. A suction cup is attached to the metal cap, which is 2 . 0 inches ( 5 . 1 cm ) in diameter. You want to lift the cap using the string attached to the suction cup. How much force would you need to apply with the string to lift the cap directly

he resistance of the skin on a person s finger is typically about 2 0 , 0 0 0 M . How much voltage would be needed to cause a current of 0 , 0 0 1 A to flow into the finger? ( This is about enough current to just be felt by most people. )

Two capacitors of values of 1 0 F and 2 0 F are connected in parallel, and in turn, are connected in series with a 3 0 F capacitor . Find the equivalent capacitance of this arrangement.

A Doppler flow meter uses ultrasound waves to measure blood - flow speeds. Suppose the device emits sound at 3 . 1 MHz , and the speed of sound in human tissue is about 1 5 4 0 m / s .

What is a factor that led to the "dust bowl" ( drought ) of the 1 9 2 0 s and 1 9 3 0 s ?

An inductor is connected across an AC source. Suppose the frequency of the source is doubled. What happens to the inductive reactance of the inductor? Question 1 options: The inductive reactance is quadrupled. The inductive reactance is reduced by a factor of 2 . The inductive reactance is reduced by a factor of 4 . The inductive reactance remains

An alpha particle ( charge + 2 e ) and an electron move in opposite directions from the same point, each with the speed of 2 . 2 0 1 0 ^ 5 m / s

A two - component model used to determine percent body fat in a human body assumes that a fraction ff ( < 1 < 1 ) of the body's total mass mm is composed of fat with a density of 0 . 9 0 g / cm 3 g / cm 3 , and that the remaining mass of the body is composed of fat - free tissue with a density of 1 . 1 0 g / cm 3 g / cm 3 . If the specific gravity

The common isotope of uranium, 2 3 8 U , has a half - life of 4 . 4 7 1 0 9 years, decaying to 2 3 4 Th by alpha emission. What is the decay constant? What mass of uranium is required for an activity of 1 . 0 0 curie ? How many alpha particles are emitted per second by 7 . 0 0 gg of uranium?

A baseball of mass m 1 = 0 . 4 1 kg is thrown at a concrete block m 2 = 9 . 5 kg . The block has a coefficient of static friction of s = 0 . 7 1 between it and the floor. The ball is in contact with the block for t = 0 . 1 0 5 s while it collides elastically. The force of interaction between the block and the ball is constant for the duration of

a ) Find the charge density ) , , ( zyx that produces the electric field ) , ( kzjyixgE + + = You are at a point ( a , b , c ) on the surface ) . 0 ( ) ( 2 / 1 2 2 2 = zyxrz Assuming both a and b are positive, in what direction must you move ( a ) so that the rate of change of z will be zero? ( b ) so that the rate of increase of z will be

The fictional rocket ship Adventure is measured to be 7 5 mm long by the ship's captain inside the rocket.When the rocket moves past a space dock at 0 . 5 cc . As rocket ship Adventure passes by the space dock, the ship's captain flashes a flashlight at 2 . 0 0 - ss intervals as measured by space - dock personnel.

Lithium has a work function of 2 . 3 0 eV . Mercury has a work function of 4 . 5 0 eV . ( i ) ( 1 0 points ) What are the cutoff wavelengths for each metal, in meters? [ Hint: you can save time by noting that hc = 1 2 4 0 eV nm . ] ( ii ) ( 5 points ) If light with a wavelength of 4 0 0 nm is used, which of the metals will exhibit the

3 0 . 3 5 L - C Oscillations. A capacitor with capacitance 6 . 0 0 1 0 - $ F is charged by connecting it to a 1 2 . 0 V battery. The capacitor is disconnected from the battery and connected across an inductor with L = 1 . 5 0 H . ( a ) What are the angular frequency a of the electrical oscillations and the period of these oscillations ( the time

CHARGING: What is RTHC ( Give your answer in k Ohms, and accurate to one decimal place ) ? k What is VTHC ( Give your answer in Volts, and accurate to one decimal place ) ? V What is INC ( Give your answer in milli Amps, and accurate to one decimal place ) ? mA What is TAUC ( Give your answer in milli Seconds, and accurate to one decimal place ) ?

7 ) Two particles, both carrying charge 6 C are traveling parallel to each other with velocities of v = 1 0 0 0 0 i ^ v = 1 0 0 0 0 i ^ in m / s . They are positioned at the points ( 0 , 3 , 0 ) ( 0 , 3 , 0 ) and ( 0 , 3 , 0 ) ( 0 , 3 , 0 ) [ all position units in meters ] . What is the magnitude and direction of the magnetic field at ( 0 , 3 , 0

What is the angular magnification in multiples of a telescope that has a 1 0 5 cm focal length objective and a 2 . 7 5 cm focal length eyepiece?
What is the angular magnification in multiples of

Which of the following is a unit of energy? Check all that apply. Joule kg meter / s 2 meter Newton k g ( m s ) 2 k g m s k g m m s 2 foot pound
Which of the following is a unit of energy? Check

The amount of energy ultimately converted to heat by an incandescent light bulb is about _ _ _ _ _ _ . Group of answer choices 1 0 % 1 0 0 % 4 0 % 8 0 %

Stress created by a force is directly related to the size of the area over which the force is spread. True False
Stress created by a force is directly related to

Question 1 2 1 pts Revisit Lab 1 ( and almost every other lab since ) to identify the slope from a theoretical model. Given the theoretical model y = a b 2 c x in which the slope is equal to 3 , a = 1 6 , b = 9 , calculate c . Question 1 3 1 pts In the previous question, I stated "almost every other lab since". There was just one lab in this
Question 1 2 1 pts Revisit Lab 1 ( and almost

\ ( ( \ # 2 \ ) Cart \ ( C \ ) and box B start at rest. Imagine a 4 0 g chewing gum ball is shot horizontally with velocity \ ( 1 5 0 \ mathrm { ~m } / \ mathrm { s } \ ) . The chewing gum hits box \ ( B \ ) , which has mass 6 kg . After the impact, the chewing gum sticks to the box and slides to the end of cart \ ( C \ ) where it - ( A ) impacts
\ ( ( \ # 2 \ ) Cart \ ( C \ ) and box B start at

An aluminum ball at room temperature in a bowl containing water at 1 1 0 degree celsius. If the mass of the ball is 8 0 grams, how much heat is absorbed by the ball?
An aluminum ball at room temperature in a bowl

Question Difficulty The X - ray spectrum for a typical metal is shown in the figure. Find the approximate wavelength of K x - rays emitted by chromium. ( Hint: An electron in the M shell is shielded from the nucleus by the single electron in the K shell, plus all the electrons in the L shell. ) nm
Question Difficulty The X - ray spectrum for a

A resistor R and another resistor 3 . 0 0 R are connected in series across a battery. If heat is produced at a rate of 1 5 . 0 W in R , then in 3 . 0 0 R it is produced at a rate of 1 3 5 W . 4 5 . 0 W 1 5 . 0 W . 5 . 0 0 W . Request Answer
A resistor R and another resistor 3 . 0 0 R are

Short Answer. A solid disk rotates at a constant 7 r a d s . A hollow sphere, initially not spinning, is dropped onto the solid disk such that their axes coincide. After the collision, the two objects rotate as one. Assume the disk and the hollow sphere have the same mass ( 3 0 0 g ) and radius ( 2 0 c m ) . Calculate the angular speed immediately
Short Answer. A solid disk rotates at a constant

The diagram shows a conductor 6 0 mm long carrying 1 2 A in a flux of density 1 . 2 T . Calculate the force acting on it and determine the direction of the force.
The diagram shows a conductor 6 0 mm long

A fast pitch softball player does a windmill pitch moving her hand through a vertical circular arc to pitch a ball at 6 6 mph . The 0 . 1 8 kg ball is 5 3 cm from the pivot point at her shoulder.

When scuba diving, at what depth does the greatest change in the volume of a gas occur? Surface to 1 0 meters 1 0 meters to 2 0 meters 2 0 meters to 3 0 meters None of these; water is not compressible and does not affect gas volume

When air - filled, a particular parallel - plate capacitor has a capacitance of c 1 = 1 2 . 7 Fc 1 = 1 2 . 7 F . When the gap between the plates is filled with a dielectric oil, the capacitance changes to c 2 = 4 5 . 9 Fc 2 = 4 5 . 9 F . A potential difference of 1 2 V 1 2 V is applied.

Gas in a container is at a pressure of 1 . 9 atm and a volume of 5 . 0 m 3 . ( a ) What is the work done on the gas ( in J ) if it expands at constant pressure to twice its initial volume? J ( b ) What is the work done on the gas ( in J ) if it is compressed at constant pressure to one - quarter of its initial volume? J

At what speed do the relativistic formulas for time intervals differ from classical values by 1 . 0 0 % ?

An electron is accelerated to a speed where its total energy is 2 1 5 times larger than its rest energy. How many times is the kinetic energy of the electron larger than its rest energy? Tries 0 / 2 0 What is the kinetic energy of the electron? Tries 0 / 2 0 What is the speed of the electron in terms of the speed of light? ( In this part of the

An electron is projected horizontally into the space between two oppositely charged metal plates. The electric field between the plates is 4 2 5 . 0 N / C , directed upward. While in the field, what is the force on the electron?

( 3 Points ) In the figure below the loop is moving with a velocity \ ( \ vec { v } \ ) to the left. The magnetic field is into the page. What is the direction of the induced current in the loop when it is still only partially in the field as drawn below? ( A ) Clockwise ( B ) Counterclockwise [ 3 points ] ( C ) The induced current will be zero.
( 3 Points ) In the figure below the loop is

Example 4 : About how accurately should we measure the radius of a sphere to calculate its surface area within 1 % of its true value?
Example 4 : About how accurately should we

If an astronaut were exactly ball way be . \ tween the Earth and the Moon, the net gravitational force exerted on the astronaut by these two objects would be ( A ) directed toward the Earth. ( B ) zero. ( C ) directed toward the Moon. ( D ) more than her weight. ( E ) None of the above.

Unpolarized light with an initial intensity 0 passes through three polarizing filters in sequence. The angles between the transmission axes of the filters and the vertical axis are: The first polarizer is at an angle of 0 The second polarizer is at an angle of 3 0 relative to the vertical The third polarizer is at an angle of 7 5 relative to the

Suppose blood has come from the heart at a rate of 5 . 3 L per minute into the aorta of radius . 8 5 cm determine the speed of blood through the aorta in centimeters per second

A ball is launched straight towards the ground from height h . When it bounces off the ground it loses

Angular acceleration is expressed in units of Question 5 0 options: 1 ) meters per second squared. 2 ) radians per second squared. 3 ) alphas per second squared. 4 ) arcs per second squared.

List the Sl metric units fir the following quantities, and indicte whether each quantity is scalar or a vector. Velocity, force, energy, power

A wire of length 2 0 cm lies on the x - axis and carries a current 2 0 mA flowing along positive x direction. Magnetic field of 0 . 3 T on the x - y plane makes an angle with the positive x axis. If the magnetic force on the wire is 0 . 5 1 mN , the angle that the magnetic field makes with the positive x axis is ( A ) 9 0 . 0 ( B ) 3 5 . 3 ( C ) 2
A wire of length 2 0 cm lies on the x - axis and

Two parallel plate capcacitors each having a capacitance of 8 . 2 1 pF , are connected in parallel across a 1 2 . 0 V battery. Each capacitor plate has an area of 2 0 0 cm ^ 2

1 0 4 . What is the z component of vec ( B ) , if vec ( A ) and vec ( B ) are perpendicular vectors? vec ( A ) = 2 hat ( ) - 2 hat ( ) + 4 hat ( k ) vec ( B ) = - 6 hat ( ) + 4 hat ( ) + zhat ( k ) a . 2 0 b . 5 c . 1 d . - 2 0 ( e ) None of the above
1 0 4 . What is the z component of vec ( B ) , if

The current I in a long, straight wire is constant and is directed toward the right as in the figure below. Conducting loops A , B , C , and D are moving, in the directions shown, near the wire. On the diagram below ( a ) draw ( and label ) the magnetic field generated by the wire. ( b ) draw ( and label ) the direction of the induced emf in each
The current I in a long, straight wire is

Two balls, one copper and one gold, have the same mass and are at the same temperature. The same quantity of heat Q is removed from both of them. Which one of the following causes their final temperatures to be different? potential or kinetic energy latent heat capacity mass density coefficient of volume expansion specific heat capacity
Two balls, one copper and one gold, have the same

1 8 . ( a ) Calculate the angle at which a - wide slit produces its first minimum for 4 1 0 - nm violet light. ( b ) Where is the first minimum for 7 0 0 - nm red light?

the density of ice is 9 1 7 kg / m ^ 3 , and the density of sea water is 1 0 2 5 kg / m ^ 3 . A swimming polar bear climbs onto a piece of floating ice that has a volume of 4 . 6 8 m ^ 3 . what is the weight of the heaviest bear that the ice can support without sinking completely beneath the water?

What is the nearest flow rate in m 3 / s of a liquid that may exit from an open - top tank through an opening h = 8 . 0 m below the water surface in the tank, where the diameter of the exiting hose, D = 1 0 cm ? Ignore atmospheric pressure. A wide hose with an inner diameter of 2 6 cm is used as a water main and it furnishes water ( through
What is the nearest flow rate in m 3 / s of a

distance \ ( d \ ) is 4 . 5 cm . The compass needle deflects 1 0 degrees from North, as shown. At this location the horizontal component of the Earth's magnetic field is \ ( 2 \ mathrm { e } - 5 \ ) tesla. What is the direction of the magnetic field at location \ ( A \ ) , midway between the wires, due to the current in the wire? Into the page
distance \ ( d \ ) is 4 . 5 cm . The compass

A moon has a mass of 1 . 3 5 1 0 2 2 kg and a radius of 0 . 7 4 1 0 6 m . It orbits around a far - away planet at a distance of 3 . 5 1 0 7 m , completing a full rotation every 3 4 earth days ( one day = 2 4 hours ) . What is the angular momentum ( in J - s ) of the moon about the planet? Provide a numeric answer only ( no units ) .

Concept Check 1 8 . 0 4 - Thermal energy transferred away from it per unit time If you double the temperature ( measured in Kelvins ) of an object, the thermal energy transferred away from it per unit time will multiple choice change by an amount that cannot be determined without knowing the temperature of the object's surroundings. decrease by a

A playground carousel is rotating counterclockwise about its center on frictionless bearings. A person standing still on the ground grabs onto one of the bars on the carousel very close to its outer edge and climbs aboard. Thus, this person begins with an angular speed of zero and ends up with a nonzero angular speed, which means that he underwent
A playground carousel is rotating

The figure shows a particle with positive charge q = 6 . 4 0 1 0 - 1 9 C moving with speed v = 8 . 0 8 1 0 3 m s toward a long straight wire with current i = 3 6 9 m A . At the instant shown, the particle's distance from the wire is d = 1 . 2 9 c m . What is the magnitude of the force on the particle due to the current? Number Units
The figure shows a particle with positive charge

A container holds 1 . 4 0 gg of oxygen at a pressure of 8 . 6 0 atmatm . Part A How much heat is required to increase the temperature by 1 1 7 C C at constant pressure? Expre

A satellite used in a cellular telephone network has a mass of 2 1 7 0 kgkg and is in a circular orbit at a height of 8 6 0 kmkm above the surface of the earth. What is the gravitational force FgravFgrav on the satellite? Take the gravitational constant to be GG = 6 . 6 7 1 0 1 1 N m 2 / kg 2 N m 2 / kg 2 , the mass of the earth to be meme = 5 . 9

2 2 . 4 8 ( a ) How many excess electrons must be distributed uniformly within the volume of an isolated plastic sphere 3 0 . 0 cm in diameter to produce an electric field of magnitude 1 3 9 0 N / C just outside the surface of the sphere? ( b ) What is the electric field at a point 1 0 . 0 cm outside the surface of the sphere?

1 0 A 9 A 4 A
1 0 A 9 A 4 A

A particle of mass 5 - kg moves under the influence of the force f = 9 / sqrtx

In a student experiment, a constant - volume gas thermometer is calibrated in dry ice ( 7 8 . 5 C ) and in boiling ethyl alcohol ( 7 7 C ) . The separate pressures are 0 . 8 9 2 atm and 1 . 6 1 7 atm. Hint: Use the linear relationship P = A + BT , where A and B are constants. ( a ) What value of absolute zero does the calibration yield? C ( b )

Question 1 6 pts 1 3 . A 2 7 . 3 g bullet traveling at 1 4 5 m s is fired into a 0 . 4 9 1 kg wooden block anchored to a 9 1 . 3 N m spring. How far in meter, is the spring compressed?
Question 1 6 pts 1 3 . A 2 7 . 3 g bullet

A person is dragging a packing crate of mass 1 0 0 kg across a rough horizontal floor where the coefficient of kinetic friction is 0 . 4 0 0 . He exerts a force F sufficient to accelerate the crate forward. At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration?
A person is dragging a packing crate of mass 1 0

Blue marbles are in motion confined in a box in a weightless environment. If the balls make perfectly elastic collisions with each other and the walls of the box, find their mosn free path. = 1 4 2 2 ( N v ) r 2 A ) 1 9 0 0 cm B ) 3 4 0 0 cm C ) 9 8 0 cm D ) 4 3 0 0 cm E ) 5 9 0 0 cm
Blue marbles are in motion confined in a box in a

Question 2 0 1 pts A conducting sphere of radius 2 0 . 0 cm carries an excess charge of + 1 5 . 0 C , and no other charges are present. The potential ( relative to infinity ) due to this sphere at a point 1 2 . 0 cm from its center is closest to 6 7 4 kV zero 9 3 8 0 kV 1 1 3 0 kV 3 3 8 0 kV
Question 2 0 1 pts A conducting sphere of radius

What is the tops precxesion frequency rpm ?
What is the tops precxesion frequency rpm ?

In an isothermal process, A . Internal energy of the system increases. B . Internal energy of the system decreases. C . Internal energy of the system does not change. D . The system is perfectly insulated from the surrounding.
In an isothermal process, A . Internal energy of

Review Constants A couple of astronauts agree to rendezvous in space after hours. Their plan is to let gravity bring them together. She has a mass of 6 6 . 0 kg and he a mass of 7 6 . 0 kg , and they start from rest 1 7 . 0 m apart. Part A Find his initial acceleration. Part B Find her initial acceleration.
Review Constants A couple of astronauts agree to

Problem 6 : A 0 . 1 3 5 - kg hockey puck with a speed of 3 5 m / s hits a young 4 5 - kg ice hockey goalie, originally at rest. In this problem, take the original direction of the puck as positive.

Problem No . 1 : A 4 kg ball moving with a velocity of 1 0 m / s collides with a 1 6 kg ball moving with a velocity of 4 m / s ( i ) in the same direction, ( ii ) in the opposite direction. Calculate the velocity of the balls in each case if they coalesce ( stick together ) on impact, and the loss of kinetic energy resulting from the impact. [

As light travels from one medium to another, does its wavelength change? Its frequency? Its speed? Explain.

What is its wavelength in fused quartz

( a ) Show that the phase velocity of the de Broglie waves of a particle of mass m and de Broglie wavelength is given by p c 1 2 ( b ) Compare the phase and group velocities of an electron whose de Broglie wavelength is exactly 1 1 0 1 3 m .

Q 2 ) . Calculate the moment of Inertia about the x - axis and y - axis as shown in the figure below.
Q 2 ) . Calculate the moment of Inertia about the

For a system where air is separated from water by a plane parallel sheet of lexan

- 9 ILW In an oscillating LC circuit with L = 5 0 m H and C = 4 . 0 F , the current is initially a maximum. How long will it take before the capacitor is fully charged for the first time?
- 9 ILW In an oscillating LC circuit with L = 5 0

Of the four criteria we've been using to evaluate energy sources, which is the largest problem for nuclear power?

internal radiation therapy does what?

does a magnetic force cause a change in the speed of a charge?

Vacuum pump is only responsible for the ascending of the liquid in climbing film evaporator. True or false

The electron in a hydrogen atom emits a photon with = 4 3 4 nm . If the electron ends up in the n = 2 energy level, what was its initial energy level

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