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# 000 x 10 7 24000004800 4800 hz 31 ms 69 mph 1033 x

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Unformatted text preview: elengths shifted higher wavelength Frequencies shifted lower Star separating from us (Expanding Universe) Our Sun Our Sun Star in a distant galaxy Example Police radars get twice the effect since the EM waves make a round trip: f ′ ≈ f ( 1 + 2β ) If f = 24,000,000,000 Hz (k-band radar gun) If 24,000,000,000 c = 300,000,000 m/s v β f’ f’-f 30 m/s (67 mph) 1.000 x 10-7 24,000,004,800 4800 Hz 31 m/s (69 mph) 1.033 x 10-7 24,000,004,959 4959 Hz Preflight 7 BB ficlicker = 900 MHz A) B) C) Need to approach i>clicker Need to shift frequency UP How fast would you need to run to see the i>clicker radiation? 1/ 2 60 50 40 30 f ′ 1014 1 + β = 9 = 105 = f 10 1− β 20 10 0 1 + β 10 = 1− β 10 Approximation Exercise: 1010 − 1 1 − 10−10 β = 10 = 10 + 1 1 + 10−10 β ≈ 1 − (2 × 10−10 ) (β > 0 ) Waves...
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