The following three questions refer to this scenario: You and your friend decide

Question

The following three questions refer to this scenario: You and your friend decide one day to eat a lot of sugar and then go play laser tag. So hyped up with chemical potential energy, you find that you are each able to run at 1/2 the speed of light (0.5c - This is going to be an interesting game of laser tag!) Early in the game you find yourself chasing your friend, with you running full out at 0.5c and your friend jogging along at 0.2c. Seeing your chance for the easy score, you fire your laser at your friend.

According to your friend, who is running away from you, how fast do the photons from your laser approach him?

Select one:

A. It is impossible to tell from the information given.

B. At 0.3c, 0.3 times the speed of light

C. At c, the speed of light

D. Slower than c but faster than 1/2 c

E. At 0.2c

Explanation / Answer

photons have the velocity as velocity of light

so the answer is

C. At c, the speed of light

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