26_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

26_Ch 21 College Physics ProblemCH21 Alternating Current Circuits and Electromagnetic Waves

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226 CHAPTER 21 21.54 Since the space station and the ship are moving toward one another, the frequency after being Doppler shifted is ( ) 1 OS ff u c =+ , so the change in frequency is () 5 14 11 8 1.8 10 m s 6.0 10 Hz 3.6 10 Hz 3.0 OSS u ff f f c  × ∆= − = = × = ×  ×  and the frequency observed on the spaceship is 14 11 14 6.0 10 Hz 3.6 10 Hz 6.003 6 10 Hz ff f = × + × = × 21.55 Since you and the car ahead of you are moving away from each other (getting farther apart) at a rate of 120 km h 80 km h 40 km h =−= u , the Doppler shifted frequency you will detect is ( ) 1 c =− , and the change in frequency is 14 7 8 40 km h 0.278 m s 10 Hz 1.6 10 Hz 3.0 1 km h × × × 4.3 S u f c The frequency you will detect will be 14 4.3 10 Hz 1. 7 14 6 4.299 999 84 10 Hz × = × 21.56 The driver was driving toward the warning lights, so the correct form of the Doppler
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