1. A light source is flashing on and off with a frequency of 1 Hz. If you were t

Question

1. A light source is flashing on and off with a frequency of 1 Hz. If you were to run really fast (say 80% the speed of light) , with your direction of motion perpendicular to the direction of the light, you would observe the frequency of the flashing to
a) increase, b) decrease, c) remain the same

2. In their common rest frame, two stars are 90.0 ly apart. If they appear to be 28.1 ly apart to a spaceship, how fast is the spaceship moving? Express your answer in terms of c?
a) 0.938c, b) 0.95c, c) 0.925c, d) 0.911c

Explanation / Answer

1) c) remain the same because motion is perpendicular to the direction of light. 2)    According to Length constraction          L = Lp [1- (v/c)^2] Here Lp = 90.0 ly and L = 28.1 ly           (28.1 ly)=(90.0 ly) [1- (v/c)^2]            v = 0.95 c

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