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Back to 28.4 Relativistic Addition of Velocities

28.4 Exercise 12

Avg difficulty 2.5

If a galaxy moving away from the Earth has a speed of 1000 km/s1000 km/s and emits 656 nm\text{656 nm} light characteristic of hydrogen (the most common element in the universe). (a) What wavelength would we observe on the Earth? (b) What type of electromagnetic radiation is this? (c) Why is the speed of the Earth in its orbit negligible here?

OpenStax College Physics 2e, 28.4 Relativistic Addition of Velocities, exercise 12

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.