If three samples have the half-lives listed below, which sample would remain radioactive the longest?
A. a sample with a half-life of 20 million years
B. a sample with a half-life of 20 hours
C. a sample with a half-life of 20 minutes
D. a sample with a half-life of 20 years
E. none of the above
Answer: A
You might also like to view...
Excess amounts of CO2 in the atmosphere have led to ocean ____________ as the oceans absorb CO2 and convert it to H2CO3.
Fill in the blank(s) with the appropriate word(s).
Most of the radiant energy emitted by Earth is in the form of ________ radiation
Fill in the blank(s) with the appropriate word(s).
In middle latitudes, rain:
A) usually begins as snow. B) is formed by the collision-coalescence process. C) is less common than in high latitudes. D) is incapable of turning to sleet.
A raccoon spends its week eating raspberries, grain, eggs, and grasshoppers. Raccoons are therefore
A) carnivores. B) omnivores. C) herbivores. D) producers.