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6_Ch 22 College Physics ProblemCH22 Reflection and Refraction of Light

# 6_Ch 22 College Physics ProblemCH22 Reflection and Refraction of Light

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238 CHAPTER 22 Problem Solutions 22.1 The total distance the light travels is Therefore, ( ) 8 6 6 2 2 3.84 10 6.38 10 1.76 10 m 7.52 10 m center to Earth Moon center d D R R = = × × × = × 8 8 8 7.52 10 m 3.00 10 m s 2.51 s d v t × = = = × 22.2 If the wheel has 360 teeth, it turns through an angle of 1 in the time it takes the light to make its round trip. From the definition of angular velocity, we see that the time is 720 rev ( ) 5 1 720 rev 5.05 10 s 27.5 rev s t θ ω = = = × Hence, the speed of light is ( ) 8 5 2 7 500 m 2 2.97 10 m s
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