Properties of Light 1. The stretching frequency of a carbonyl (C=0) bond in a typical ketone is 5.15 x 1013 Hz. The vibrational energy of the molecule increases when light of this frequency is absorbed.   a) What is the wavelength of this light in nanometers? b) What is the wavelength of this light in micrometers? c) Express the frequency of this light in wavenumbers. d) What is the energy (in joules) of a single photon of light at this frequency? e) What is the energy (in kilojoules) of one mole of photons at this frequency? f) Into what region of the electromagnetic spectrum does this radiation fall?

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