If you have 10,000 grams of a substance that decays with a half-life of 14 days, then how much will you have after 56 days?
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See the image below.
An excited electron is in a <em>high-energy state</em>.
When it drops to the lower-level ground state, it must get rid of this excess energy by <em>emitting it</em> as a quantum of light.
