In one of the rocks brought back from the Moon, it is found that 80.5% of the

Question:

In one of the rocks brought back from the Moon, it is found that 80.5% of the initial potassium-40 in the rock has decayed to argon-40.

(a) If the half-life for this decay is 1.20 × 109 years, how old is the rock?

(b) How much longer will it take before only 10.0% of the original potassium-40 is still present in the rock?

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For book-img-for-question

Physics

ISBN: 978-0321976444

5th edition

Authors: James S. Walker

See More Books

Question Posted: Aug 31, 2017 02:12 PM

See More Questions

Astronauts who landed on the moon during the Apollo 15, 16 and 17 missions brought back a large collection of rocks to the earth. Knowing the rocks weighed 139 lb when they were on the moon,...
Suppose the rock bed in Problem 7.37 has been completely discharged and the entire bed is at 10?C. Hot air at 90?C and 0.2 m/s is then used to recharge the bed. How long will it take until the first...
One method of storing solar energy for use during cloudy days, or at night, is to store it in the form of sensible heat in a rock bed. Suppose such a rock bed has been heated to 70?C and it is...
Viscosity variation and velocity gradients in a non isothermal film, water is falling down a vertical wall in a film 0.1 mm thick. The water temperature is 100C at the free liquid surface and 80C at...
Effective strategic leadership means maintaining a superior alignment between an organization and its environment. In what ways did Anderson focus on and achieve this goal at Best Buy?
Fill in the missing amounts in the following schedules. April May $60,000 June 1. Sales $80,000 Cash receipts: From cash sales From sales on accountt Total cash receipts $45,000 34,000 2. Accounts...
Gavin Jones was mystified by Ito's lemma when he first studied it, so he tested it. He started with $S$ governed by and found that $Q=\ln S$ satisfies He then applied Ito's lemma to this last...
PARC Company has money to invest in an employee benefit plan, and you have been chosen as the plan's trustee. As an employee yourself, you want to maximize the interest earned on this investment and...
1. State and describe in detail, the concept that must economically communicate what a brand is and what it is not. Give an example. 2. State and describe in detail a concept that describes a...
Sketch a free-body diagram of each element in the figure. Compute the magnitude and direction of each force using an algebraic or vector method, asspecified. 100 lbf 12 in 6 in
The two radioactive decay series that begin with 232 90 Th and end with 208 82 Pb are shown in FIGURE 32-22. Identify the ten intermediary nuclei that appear in these series. 232TH 90 Alpha decay...
Gas lanterns used on camping trips have mantles (small lacy bags that give off light) made from a rayon mesh impregnated with thorium and other materials. Thorium is used, even though it is...
Consider the nonequilibrium process described in Problem 3.109. Determine the work done by the carbon dioxide in the cylinder during the process. A cylinder has a thick piston initially held by a pin...
What discount rate would ensure a sustainable harvest is set to Maximum Sustainable Yield?
A chlorine (CI) and bromine (Br) atom are adsorbed on a small patch of surface (see sketch at right). This patch is known to contain 36 possible adsorption sites. The Cl and bromine (Br) atoms have...
ABC Limited borrows $ 1 0 0 , 500 from a bank on the following terms: arrangement fees of $ 2 , 0 0 0 are charged by the bank and deducted from the initial proceeds on the loan; interest is payable...
Budgeting for Sales, Production, Direct Materials, Direct Labor, and Manufacturing Overhead. Hershel s Chocolate produces chocolate bars and sells them by the case ( 1 unit = 1 case ) . Information...
NewTone, Inc makes MP3 players and uses standard costing. They recently used 21,000 labor hours to produce 8,000 units. They originally budgeted 20,000 hours to produce 11,000 units with payroll of...
The accompanying file contains five years of monthly data for the time series y. Create the time variable and the monthly dummy variables to estimate an exponential trend model with seasonal dummy...
In Problems 1522, find the principal needed now to get each amount; that is, find the present value. To get $750 after 2 years at 2.5% compounded quarterly.
Cite an example of something with a constant speed that also has a varying velocity. Can you cite an example of something with a constant velocity and a varying speed? Defend your answers.
Cite an example of something that undergoes acceleration while moving at constant speed. Can you also give an example of something that accelerates while traveling at constant velocity? Explain.
On which of these hills does the ball roll down with increasing speed and decreasing acceleration along the path? (Use this example if you wish to explain to someone the difference between speed and...
The uniform meterstick has an object with mass 800 grams hanging at the 15cm mark and an object with mass 350 grams at the 70cm mark. It balances horizontally on a pivot placed at the 35cm mark. What...
Compared to Windows environments, is UNIX system friendlier for digital investigation? Discuss this question from the following aspects: UNIX as the platform for forensic investigation and UNIX as...
13) Imagine that in your monthly entertainment budget, you have $156 to spend on movies and books, which cost $8 and $20 respectively. Use the data in the table below to decide what combination of...

In one of the rocks brought back from the Moon, it is found that 80.5% of the

Question:

Step by Step Answer:

Solve Equation 329 for the age of the rock where the decay constant is c...View the full answer

Physics

Students also viewed these Modern Physics questions