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

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

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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

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

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

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

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Spectroscopy
Vibrational spectroscopy is

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

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