Answer to Question #285935 in Physics for Ella

Question

1. Radio signals from a distant planet are received at a frequency of 106 MHz on a spaceship headed directly toward the planet at a speed of 0.30c. What is the frequency of the radio signal as measured on that planet?

2. The red light emitted by a hydrogen has a wavelength of 550 m measured in the laboratory. An astronomer studying a distant star observes light at a longer wavelength which he believes is hydrogen light that has been Doppler-shifted because of the star's motion. If the observed wavelength is 754 mm, is the star moving toward or away from him?

Answer 1

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