6_Chapter 22 HomeworkCH22 Reflection and Refraction of Light

6_Chapter 22 HomeworkCH22 Reflection and Refraction of...

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238 CHAPTER 22 Problem Solutions 22.1 The total distance the light travels is Therefore, () 866 2 2 3.84 10 6.38 10 1.76 10 m 7.52 10 m center to Earth Moon center dD R R  ∆=   × × = × 8 8 8 7.52 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 1720 rev 5.05 10 s 27.5 rev s t θ ω = × Hence, the speed of light is ( )
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