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Class 11 Physics (India)

Course: Class 11 Physics (India) > Unit 19

Lesson 7: The Doppler effect

Doppler effect introduction
Doppler effect: Wavefront diagrams and word problems
Doppler effect review
Doppler effect formula for observed frequency
Doppler effect formula when source is moving away
When the source and the wave move at the same velocity
Doppler effect for a moving observer
Doppler effect: reflection off a moving object

Doppler effect: Wavefront diagrams and word problems

A speaker at rest plays a sound with constant frequency f, start subscript, 0, end subscript near a straight train track. Train A moves toward the speaker, and train B moves away from the speaker.

How does the frequency, f, start subscript, A, end subscript, observed by a rider on train A compare to the frequency, f, start subscript, B, end subscript, observed by a rider on train B?

(Choice A)
f, start subscript, A, end subscript, is greater than, f, start subscript, B, end subscript
(Choice B)
f, start subscript, A, end subscript, is less than, f, start subscript, B, end subscript
(Choice C)
f, start subscript, A, end subscript, equals, f, start subscript, B, end subscript

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Class 11 Physics (India)

Course: Class 11 Physics (India) > Unit 19

Problem