Spectroscopy
A simple harmonic oscillator may absorb energy

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

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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
light is faster today that it used to be
None of these

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