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539_Physics ProblemsTechnical Physics

539_Physics ProblemsTechnical Physics - Chapter 18 Section...

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Chapter 18 541 Section 18.6 Standing Waves in Rod and Plates P18.49 (a) f v L = = = 2 5 100 2 1 60 1 59 a fa f . . kHz (b) Since it is held in the center, there must be a node in the center as well as antinodes at the ends. The even harmonics have an antinode at the center so only the odd harmonics are present. (c) f v L = = = 2 3 560 2 1 60 1 11 a fa f . . kHz P18.50 When the rod is clamped at one-quarter of its length, the vibration pattern reads ANANA and the rod length is L d = = 2 AA λ . Therefore, L v f = = = 5 100 4 400 1 16 m s Hz m . Section 18.7 Beats: Interference in Time P18.51 f v T f new Hz = = 110 540 600 104 4 . f = 5 64 . beats s P18.52 (a) The string could be tuned to either 521 Hz or 525 Hz from this evidence.
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