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Back to 17.4 Doppler Effect and Sonic Booms

17.4 Exercise 12

Avg difficulty 2.5

A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s. (a) An observer waiting at the crossing receives a frequency of 208 Hz. What is the speed of the train? (b) What frequency does the observer receive as the train moves away?

OpenStax College Physics 2e, 17.4 Doppler Effect and Sonic Booms, 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.