Spectroscopy
A simple harmonic oscillator may absorb energy

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

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Spectroscopy
Why are rotational transitions of little use to a spectroscopist?

Because rotational transitions are extremely rare
Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
Because the energy required to induce a rotational transition is so small that it cannot be measured
All of these

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Spectroscopy
Vibrational spectroscopy is

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

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Spectroscopy
Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?

Because %T is dependant on the power of the incident radiation
Because absorbance is proportional to the concentration of the analyte, whereas %T is not
None of these
Because %T cannot be measured as accurately as absorbance

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