1214_Physics ProblemsTechnical Physics

1214_Physics ProblemsTechnical Physics - Chapter 43 P43.20...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 43 555 P43.20 The emission energies are the same as the absorption energies, but the final state must be below vJ == 10 , bg . The transition must satisfy J 1, so it must end with J = 1. To be lower in energy, it must be 01 , . The emitted photon energy is therefore h f EE hf hf hf vv JJ photon vib rot vib rot vib vib rot rot photon vib rot =+−+=−−− =− = = 1 0 ej e j Thus, ff f photon vib rot Hz Hz Hz =−= × −× = × 6 42 10 115 10 6 41 10 13 11 13 .. . . P43.21 The moment of inertia about the molecular axis is Im rm x =+= × 2 5 2 5 4 5 200 10 22 1 5 2 . m . The moment of inertia about a perpendicular axis is R m Rm y = F H G I K J + F H G I K J 2 10 2 m . The allowed rotational energies are E I rot = F H G I K J + = 2 2 1 a f , so the energy of the first excited state is E I 1 2 = = . The ratio is therefore E E I I I I m m x y x y y x 1 1 2 2 10 2 15 2 5 2 9 12 45 5 8 10 6 25 10 , , . . . = × × × = = m m . Section 43.3 Bonding in Solids P43.22 Consider a cubical salt crystal of edge length 0.1 mm. The number of atoms is 10 10 4 9 3 17 × F H G I K J m 0.261 10 m ~. This number of salt crystals would have volume
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online