Spectroscopy
A simple harmonic oscillator may absorb energy

at no time.
when the amplitudes are the same.
at anytime.
when the frequencies match exactly

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Spectroscopy
Vibrational spectroscopy is

an Infrared spectroscopy
a large mass on a weak spring
a flashlight through a prism and shake it
a class of spectroscopic techniques which analyzes molecular motions

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Spectroscopy
Beer's Law states that

absorbance is proportional to both the path length and concentration of the absorbing species
absorbance is equal to P0 / P
absorbance is proportional to the log of the concentration of the absorbing species
None of these

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