The amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.
What is radioactivity?
The term radioactivity has to do with the spontaneous disintegration of a substance.
To determine the mass of the K-42 that remains, we must have the half life of the isotope or the decay constant and both information are missing.
However, the amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.
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