21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
21ST CENT.ASTRONOMY(LL)W/CODE WKBK PKG.
6th Edition
ISBN: 9780393874921
Author: PALEN
Publisher: Norton, W. W. & Company, Inc.
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Chapter 21, Problem 23QP
To determine

Two predictions of Big Bang Theory verified by observations.

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Consider a pure sample of a radioactive isotope with a mass number of (50).  If the sample has mass of (25.0) micrograms and the isotope has a half-life of (17.5)x106 years, determine the decay rate for the sample.   Give your answer in decays/second and with 3 significant figures.
A = 13, B = 04, C = 4 A particular radioactive isotope has a half-life of (29.8) years.  If the initial amount of the isotope was (28.5) g, how years later will the only (7.20) g remain of this isotope?    Give your answer in years and with 3 significant figures.
A particular radioactive isotope has a half-life of (6.5) hours. If you have (24.5) g of the isotope at 10:00 AM, how much will you have at 7:30PM? Give your answer in grams (g) and with 3 significant figures.
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