Ans to the even-numbered assigned problems in Ch 26, 28, 29

The following is a list of the answers to the even-numbered assigned problems. IF YOU SUSPECT THAT THERE IS AN ERROR IN THIS LIST, PLEASE LET ME KNOW RIGHT AWAY!

Chapter 26

26.4
(a) constructive
(b) 34.0 cm
(c) 68.0 cm

26.28 506 nm

26.34
(a) 481 nm
(b) ±32.1°

26.44 0.559 nm

26.48 1.46 km

26.54
(b) 427 Hz
(c) 0.796 m

26.64
(a) 594 nm, 424 nm
(b) 495 nm

26.68 198 m

Chapter 28

28.24
(a) emitted
(b) 434 nm

28.28
(a) 1.96 eV = 3.14 × 10⁻¹⁹ J
(b) 633 nm
(c) 620 nm

28.36
(a) 4.39 × 10⁻⁴ nm
(b) 0.04294 nm
(c) loses 300 eV
(d) 300 eV

28.50
(a) 0.0607 V
(b) 248 eV
(c) 20.5 × 10⁻⁶ m

28.60
(a) 4.85 pm
(b) 0.256 MeV

Chapter 29

29.2
(a) 3h-bar
(b) 3.46h-bar; L is larger
(c) 3h-bar: 30.0°; 2h-bar: 54.7°; h-bar: 73.2°; 0: 90.0°; −h-bar: 106.8°; −2h-bar: 125.3°; −3h-bar: 150.0°

29.6
(a) 10; m_l = 0,±1,,±2 with s = ±½ for each
(b) none

29.14
(a) 1s²2s²
(b) Z = 12, magnesium: 1s²2s²2p⁶3s²
(c) Z = 20, calcium: 1s²2s²2p⁶3s²3p⁶4s²

29.40
(a) 3h-bar

Lewis Ford
Physics Department
Texas A&M University
ford@physics.tamu.edu

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