Essential University Physics
4th Edition
ISBN: 9780134988566
Author: Wolfson, Richard
Publisher: Pearson Education,
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Question
Chapter 38, Problem 87PP
To determine
The percentage of U-235 in natural uranium 2 billion years ago.
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4. A radioactive sample, with an initial mass of 28 mg, has a half - life
of 5 days. What is the amount of radioactive sample remaining after
2 weeks?
A = mo
(0.5)t/5
Final
Initial
amount
mass
O 4.0 mg
O 21.2 mg
O 14.0 mg
O 11.2 mg
9. A rock that contains 1.2x10-12 mol of 232Th (t1/2 = 1.4x1010 yr) has 4.2x105 fission tracks, each
track representing the fission of one atom of 232Th. How old is the rock?
The curve to the right shows the radioactive decay
of a particular sample of a nucleus called Element
9. A particular nucleus survives for the first 10
hours, what is the probability that particular
nucleus of Element 9 will decay between 10 hours
and 20 hours?
N
400 -
a. 50.0%.
b. 75.0%.
100-
c. 25.0%.
d. above 98%.
5
10
15 t (in hrs)
e. 86.5%.
Chapter 38 Solutions
Essential University Physics
Ch. 38.1 - Prob. 38.1GICh. 38.2 - Prob. 38.2GICh. 38.3 - Prob. 38.3GICh. 38.4 - Prob. 38.4GICh. 38.5 - Prob. 38.5GICh. 38 - Prob. 1FTDCh. 38 - Prob. 2FTDCh. 38 - Prob. 3FTDCh. 38 - Prob. 4FTDCh. 38 - Why are iodine-131 and strontium-90 particularly...
Ch. 38 - Prob. 6FTDCh. 38 - Prob. 7FTDCh. 38 - Prob. 8FTDCh. 38 - Prob. 9FTDCh. 38 - Prob. 10FTDCh. 38 - Three radon isotopes have 125, 134, and 136...Ch. 38 - Prob. 12ECh. 38 - Prob. 13ECh. 38 - Prob. 14ECh. 38 - Prob. 15ECh. 38 - How many half-lives will it take for the activity...Ch. 38 - Prob. 17ECh. 38 - Prob. 18ECh. 38 - Prob. 19ECh. 38 - Prob. 20ECh. 38 - Prob. 21ECh. 38 - Find the total binding energy of oxygen-16, given...Ch. 38 - Determine the nuclear mass of nickel-60, given...Ch. 38 - Prob. 24ECh. 38 - Prob. 25ECh. 38 - Prob. 26ECh. 38 - Prob. 27ECh. 38 - Prob. 28ECh. 38 - Prob. 29ECh. 38 - Prob. 30ECh. 38 - Prob. 31ECh. 38 - Prob. 32ECh. 38 - Prob. 33ECh. 38 - Prob. 34ECh. 38 - Prob. 35ECh. 38 - Prob. 36ECh. 38 - Prob. 37ECh. 38 - Prob. 38ECh. 38 - Prob. 39ECh. 38 - Prob. 40ECh. 38 - Prob. 41ECh. 38 - Prob. 42PCh. 38 - Prob. 43PCh. 38 - Prob. 44PCh. 38 - Iron-56, with nuclear mass 55.9206 u, is among the...Ch. 38 - Prob. 46PCh. 38 - Prob. 47PCh. 38 - Prob. 48PCh. 38 - Prob. 49PCh. 38 - Nitrogen-13 is a 9.97-min-half-lifc isotope used...Ch. 38 - Prob. 51PCh. 38 - Prob. 52PCh. 38 - Prob. 53PCh. 38 - Prob. 54PCh. 38 - The table below lists reported levels of...Ch. 38 - Prob. 56PCh. 38 - Analysis of a Moon rock shows that 82% of its...Ch. 38 - Prob. 58PCh. 38 - Prob. 59PCh. 38 - Prob. 61PCh. 38 - Prob. 62PCh. 38 - Prob. 63PCh. 38 - Prob. 64PCh. 38 - Prob. 65PCh. 38 - Prob. 66PCh. 38 - Prob. 67PCh. 38 - Prob. 68PCh. 38 - Prob. 69PCh. 38 - Prob. 70PCh. 38 - Prob. 71PCh. 38 - Prob. 72PCh. 38 - Prob. 73PCh. 38 - Prob. 74PCh. 38 - Bismuth-209 and chromium-54 combine to form a...Ch. 38 - Prob. 76PCh. 38 - Prob. 77PCh. 38 - Prob. 78PCh. 38 - Prob. 79PCh. 38 - Prob. 80PCh. 38 - Prob. 81PCh. 38 - Prob. 82PCh. 38 - Prob. 83PCh. 38 - Prob. 84PCh. 38 - Prob. 85PCh. 38 - Prob. 86PPCh. 38 - Prob. 87PPCh. 38 - Prob. 88PPCh. 38 - Prob. 89PP
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Similar questions
- Natural uranium consists of 235U(percent abundance = 0.7200%, =3.121017/s ) and 238U (percent abundance = 99.27% , =4.921018/s ). What were the values for percent abundance of 235Uand 238Uwhen Earth formed 4.5109years ago?arrow_forwardIf a 1.50cmthick piece of lead can absorb 90.0% of the rays from a radioactive source, how many centimeters of lead are needed to absorb all but 0.100% of the rays?arrow_forwardA radioactive sample initially contains 2.40102 mol of a radioactive material whose half-life is 6.00 h. How many moles of the radioactive material remain after 6.00 h? After 12.0 h? After 36.0 h?arrow_forward
- A radioactive sample has an activity R. For each of the following changes, indicate whether the activity would increase, decrease. or remain unchanged. Indicate your answers with I, D, or U. (a) The number of radioactive nuclei in the sample is doubled. (b) The half-life of the radioactive nuclei is doubled. (c) The decay constant is doubled. (d) A time period equal to two half-lives is allowed to elapse.arrow_forwardA radioactive sample has an activity R. For each of the following changes, indicate whether the activity would increase, decrease. or remain unchanged. Indicate your answers with I, D, or U. (a) The number of radioactive nuclei in the sample is doubled. (b) The half-life of the radioactive nuclei is doubled. (c) The decay constant is doubled. (d) A time period equal to two half-lives is allowed to elapse.arrow_forwardAfter 32 days, only 1/16 of a radioactive sample remains. What is the half-life of this sample? A. 2 days B. 4 days C. 8 days D. 16 days E. 2 daysarrow_forward
- The amount of radioactive 40K in a 70kg person is approximately 5000Bq. A) what is the number (N) of radioactive 40K nuclei in the body? The half life of 40K is 1.25x109 years. B)What is the amount of natural potassium (in grams) in the body? The abundance of 40K is 0.012% of the natural potassium 39Karrow_forwardSuppose a radioactive nucleus has a half-life of 2 min. and suppose the counting rate at time t = 0 is 3000 counts/10 sec. a. What is the counting rate after 2 min? b. After 6 min? c. After 10 min? d. After 20 min?arrow_forward2. The half-life of Ni-63 is 100 yrs. If you had 100g of Ni-63, how much would be left over 500 yrs?arrow_forward
- 8. The half-life for a radioactive isotope is 4.00 × 10⁹ yr. Determine the age (in years) of a rock specimen that contains sixty percent of its original number of radioactive atoms. years 0 ssi sf60 ss” 50 ssf6€ ssf60 sta £60arrow_forwardYou are experimenting with a radioactive sample of polonium. At the end of 14.0 minutes, exactly 1/16 of the polonium remains. The corresponding half-life, T2 , of polonium is: a. 0.875 minutes. b. 1.14 minutes. c. 1.75 minutes. d. 3.50 minutes. e. 4.67 minutes.arrow_forwardA radioactive isotope decays by - emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 8000 - particles. After 2 more minutes, the number of radioactive nuclei remaining will be closest to: A) 250. B) 500. C) 2000. D) 1500. E) 1000arrow_forward
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