Spectroscopy
Which of the following relationships between absorbance and %transmittance is incorrect?

All are correct
A = 2 - log10 %T
A = log10 100 / %T
A = log10 1 / T

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

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

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Spectroscopy
In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the

None of these
absence of broad spectrum of wavelenth
light is faster today that it used to be
the Fourier Transfer Algorithm allows us to scan all frequencies at once

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