CHM 411/511
Problem set 1
1. What is the wavelength of a photon that has three times as much energy as that of a photon whose
wavelength is 450 nm?
2. Calculate the frequency in hertz, the wave number, the energy in joules, and the energy in kJ/mol
associated with the 5.715 μm vibrational absorption band of an aliphatic ketone.
3. Calculate the reflection loss when a beam of radiant passes through an empty quartz cell assuming the
refraction index of quartz is 1.55.
4. When the D line of sodium light impinges an air/diamond interface at an angle of incidence of 30.0
degrees, it is found that the angle of reflection is 11.9 degrees. What is nD for diamond?
5. Explain why the transmitted radiation, Ir, is always less than the radiation, Io incident onto a cuvet, even
if there is no absorption of radiation by the contents of the cuvet?
6. Calculate the velocity, frequency, and wavelength of the magnesium line (λ= 285.2 nm) as light from
this source passes through a species whose refractive index is 1.86.
