25_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

# 25_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

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Alternating Current Circuits and Electromagnetic Waves 225 (b) For the FM band, 8 min 6 max 3.00 10 m s 2.78 m 108 10 Hz c f λ × == = × 8 max 6 min 3.00 3.4 m 88 c f × = × 21.52 The transit time for the radio wave is 3 4 8 100 10 m 3.33 10 s 0.333 ms 3.00 R R d t c × = × = × and that for the sound wave is 3 3.0 m 8.7 10 s 8.7 ms 343 m s s s sound d t v = × = Thus, the radio listeners hear the news 8.4 ms before the studio audience because radio waves travel so much faster than sound waves. 21.53 If an object of mass m is attached to a spring of spring constant k , the natural frequency of vibration of that system is
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