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An astronaut moving at a speed of 0.6c relative to the earth send radio signal with...

An astronaut moving at a speed of 0.6c relative to the earth
send radio signal with a frequency of 100 Ghz (Ghz = 109 Hz). Find the wavelength as
measured from an observer at rest on earth given that:
a) The spaceship is moving toward the earth.
b) The spaceship is moving away from the earth.

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