964_Physics ProblemsTechnical Physics

# 964_Physics ProblemsTechnical Physics - Chapter 34 P34.43(a...

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Chapter 34 305 P34.42 (a) λ == × × = c f 300 10 1150 261 8 1 . m s 10 s m 3 so 180 0690 m 261 m wavelengths = . (b) × × = c f 98 1 10 306 8 61 . . . ms s m so 180 58 9 m 3.06 m wavelengths = . P34.43 Time to reach object × = × −− 1 2 1 2 4 00 10 2 00 10 44 total time of flight s s bg ej .. . Thus, dv t × × = × = 3 00 10 2 00 10 6 00 10 60 0 84 4 . . s m km e j . P34.44 The time for the radio signal to travel 100 km is: t r = × × 100 10 333 10 3 4 m 3.00 10 m s s 8 The sound wave travels 3.00 m across the room in: t s × 300 875 10 3 . . m 343 m s s . Therefore, listeners 100 km away will receive the news before the people in the news room by a total time difference of t −× −−− 8 75 10 3 33 10 8 41 10 343 ... s s . P34.45 The wavelength of an ELF wave of frequency 75.0 Hz is × c f 75 0 400 10 8 6 . . . Hz m . The length of a quarter-wavelength antenna would be
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