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26_Chapter 21 HomeworkCH21 Alternating Current Circuits and Electromagnetic Waves

# 26_Chapter 21 HomeworkCH21 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 O S f f 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 10 m s O S S u f f 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 O S f f 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 O S f f u 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 10 m s 1 km h O S f f f  = = × = − ×  ×  4.3 S u f c = − The frequency you will detect will be 14 4.3 10 Hz 1. = × 7 14 6 10 Hz 4.299 999 84 10 Hz O S
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