College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 33

An astronaut is traveling in a space vehicle that has a speed of 0.500 c relative to Earth. The astronaut measures his pulse rate at 75.0 per minute. Signals generated by the astronaut's pulse are radioed to Earth when the vehicle is moving perpendicular to a line that connects the vehicle with an Earth observer. (a) What pulse rate does the Earth observer measure (b) What would be the pulse rate if the speed of the space vehicle were increased to 0.990 c