In radioactive decay, when the parent material decays to one-half of its original amount, the time is
A) one half-life.
B) two half-lives.
C) three half-lives.
D) four half-lives.
Answer: A
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In the diagram, which of the transitions would absorb a photon with the smallest energy (longest wavelength)?
a. Transition 1
b. Transition 2
c. Transition 3
d. Transition 4
e. Transition 5
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