Inquiry into Physics
Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Chapter 11, Problem 4Q
To determine

Which of the following quantities can you specify for the isotope? (a) Its atomic number (b) Its neutron number (c) Its atomic mass (or nucleon) number.

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Technetium-99m is a radioactive isotope with a half-life of 6 hours. If a sample of was originally 100 mg, how much would remain after 24 hours?
Consider an initial amount of 708g of radioactive material with half-life h=3.2hdays. Use a spreadsheet to record the initial amount (at day 0) and to calculate the amounts left at 1day intervals, up to day 10 included. What is the average amount of material over the time interval from day 0 to day 10? Round your answer to the nearest integer:
Q2The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of3.3 hours. If 1 gram of this isotope is present initially, how long will it take for 90% of the lead to decay?
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