Alaser fires a photon from a rocket ship passing the earth with a speed of 0.7c. what speed do the physicists on earth measure for the photon?
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c' = - c

Explanation:

given data:

speed of rocket ship is 0.7 c

from the information given in the question, earth is rest and rocket ship pass the earth with velocity of 0.7c

speed of photon measured by physicists will be

by using lorentz transform equation we get

c' = - c

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