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Unformatted text preview: Chem 120A Problem Set 4 Out: March 22, 2006; Due: April 7, 2006 IN CLASS 1. a) In the infrared spectrum of H 79 Br, there is an intense line at 2630 cm- 1 . Calculated the force con- stant of H 79 Br and the period of vibration of H 79 Br. b) The force constant of 79 Br 79 Br is 240 N m- 1 . Calculated the fundamental vibrational frequency and zero-point energy of 79 Br 79 Br c) Calculate the average z component of angular momentum, h L z i , for an electron in a ring of constant potential when it has the wavefunction: i ) ( ) = r 1 sin3 and ii ) ( ) = r 1 2 e- 3 i . 2. The Earth (mass = 6 10 24 kg) rotates about the sun (at an average distance of r = 1 . 5 10 11 m) once per year (one year = 10 million seconds). a) What is the Earths angular momentum with respect to the sun in units of h ? b) What is the smallest principle quantum number n that allows the electron in a hydrogen atom to have this value of angular momentum? c) How large is such an atom? Use h r i for the H atom in the 1 s state to express this size....
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This note was uploaded on 01/25/2011 for the course CHEM 120A taught by Professor Whaley during the Spring '07 term at University of California, Berkeley.
- Spring '07