2. Using Wien formula, find the energy density u, at wavelength 1 =450 nm at temperature T=750 K, where a =0.015 and b' =750

The infrared spectrum of 75Br19F consists of an intense line at 380. cm-1. Calculate its force constant, k, in units of N/m. (You can use the example as a sanity check.)

8-1. Show that the atomic unit of energy can be written as ħ² e² ma Απερβο En = me 16π εjht

51) A photon of energy 1.24 eV is absorbed by a molecule. a) What is its wavelength in cm and the reciprocal of its wavelength in cm-1? A..........cm                                         B..........cm-1   The molecule transitions to an energy level of 0.24 eV, and emits a photon. b) What is the energy of the emitted photon (eV)?  ..........eV c) What is its wavelength in cm and the reciprocal of its wavelength in cm-1? C..........cm                                         D..........cm-1 d) Find D-B in cm-1. ..........cm-1   The second photon of energy 1.14 eV is absorbed by the same molecule. e) What is its wavelength in cm and the reciprocal of its wavelength in cm-1?   E..........cm                                         F..........cm-1   The molecule transitions to an energy level of 0.24 eV, and emits a photon. f) What is the energy of the emitted photon (eV)?  ..........eV g) What is its wavelength in cm and the reciprocal of its wavelength in cm-1? G..........cm…