21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 8.2, Problem 8.2CYU
To determine

The amount of element A remaining after 40seconds.

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5.  If a 10-gram sample of a radioactive substance has a half-life of 6000 years, how much would be present after 8000 years? 6.  If Nitrogen-14 absorbs an alpha particle and then emits a Hydrogen-1, what is the resulting nucleus?
What is "half-life"? Select one: a. The time needed for half of the radioactive atoms in a sample to decay b. the time needed for a radioactive atom to lose half its energy c. the time needed for the mass of a radioactive atom to decrease by one-half
Why are some radioactive substances dangerous for a very long time? Select one: a. Some radioactive substances have very long half-lives. It takes a long time for the number of radioactive atoms to decrease. b. Some radioactive atoms combine easily with minerals in the ground, so they can't be removed from the environment. c. Some radioactive atoms combine easily with organic molecules. They get into the food chain where they can't be removed. d. Some radioactive molecules are very light, so they stay in the air for long periods of time.
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