A spaceship traveling from Earth to Alpha Centauri sends a transponder signal back to Earth every hour. The spaceship is moving at a speed of relative to Earth, and the frequency of the waves is 10 MHz in the rest frame of the spaceship. What is the frequency of the waves in the rest frame of Earth?
In the spectrum of light from a star that is moving toward Earth, every wavelength of light has been shifted by a factor of . At what speed must the star be moving toward Earth?
An emission line in the spectrum of the light from a star is at a frequency of Hz in the rest frame of a laboratory on Earth. The star is moving away from Earth at a speed of . What was the frequency of the emission line in the rest frame of the star? Ignore the effect of cosmological redshift. Give your answer to 3 significant figures.