All Question

Part A: Light I Light Matter Interaction (14 marks) 1) Explain constructive and destructive interference. Draw the resultant of the following interferences based on superposition principals. Determine which two waves are in phase and which two waves are out of phase (2 marks) 2) Explain how rainbow forms. Draw the path of light in a droplet completely and explain. (2 marks) 1. What is photon? What are the properties of photon? (3 marks) 2. Explain absorption and emission. Support your answer with figures. (2 marks)3. Show Lyman, Balmer and Paschen series in the following figure. (Note that the negative sign of energy is only another kind of demonstration of energy levels.) (3 marks) ionization -0.544 ev n= 5 -0.85 ev n=4 -1.51 eV second excited state n = 3 -3.4 eV first excited state n = 2 -13.6 eV ground state n = 1 4. Light with a wavelength of 525 nm is green. Calculate the energy in joules for a green light photon. ( You may calculate frequency first knowing the speed of light and the Plank's constant) (2 marks)1) Explain the absolute zero temperature. What are the actual values of the absolute zero in three different commonly used measuring temperature scales? (2 marks) 2) In the following gure write the name of each process of changing phase of the matter. (2 marks) 5 h Ga 3) The boiling point of water is changing with altitude from the sea level. The boiling point of water is 98.2 Celsius on top of the CN tower. Determine this point in Kelvin and Fahrenheit. Show your work. (2 marks) Liquid Plasma 4) How can we see black and white colors in spite of the fact that these colors are not exist in the visible spectrum? (1 mark)