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# problems_39 - PHY2061 R D Field Chapter 39 Problems Problem...

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PHY2061 R. D. Field Problems Chapter 39 Page 1 of 5 Chapter 39 Problems Problem 1: Observer A , on earth, signals with a flashlight every six minutes. Observer B is on a space station that is stationary with respect to earth. Observer C is on a rocket traveling from A to B with a constant speed of V = 0.6c relative to A. (a) At what intervals does B receive the signals from A (according to B )? (b) At what intervals does C receive the signals from A (according to A )? (c) At what intervals does C receive the signals from A (according to C )? Problem 2: A rocket travelling in the x direction at a constant speed of V = 0.7c emits radio waves at a rest frequency of 200 MHz to communicate with an observer A at rest on the x-axis as shown in the Figure . At what frequency ( in MHz ) should observer A tune his radio in order get a clear signal from the rocket, (a) when the rocket makes an angle θ = 135 o with the x-axis? (b) when the rocket makes an angle θ = 90 o with the x-axis? (c) when the rocket makes an angle θ = 45 o with the x-axis? Problem 3: A point source of light is located 10 meters below the surface of a large lake ( n=1.3 ). What is the diameter ( in m ) of the largest circle on the pool’s surface through which light coming directly from the source can emerge?

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problems_39 - PHY2061 R D Field Chapter 39 Problems Problem...

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