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# Manfra9 - Course Business PHYS342 Lecture 9 3nd problem set...

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Course Business: PHYS342 Lecture 9 3nd problem set due this Friday. There will be an in class practice exam given this Friday. Use this time to prepare for the real exam on Feb 11th. You can keep the exam after class, solutions will be posted over the weekend.

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2.10: The Doppler Effect A similar change in sound frequency occurs when the source is fixed and the receiver is moving. But the formula depends on whether the source or receiver is moving. The Doppler effect in sound violates the principle of relativity because there is in fact a special frame for sound waves. Sound waves depend on media such as air, water, or a steel plate in order to propagate. Of course, light does not! Christian Andreas Doppler (1803-1853) The Doppler effect for sound yields an increased sound frequency as a source such as a train (with whistle blowing) approaches a receiver and a decreased frequency as the source recedes.
Waves from a source at rest Viewers at rest everywhere see the waves with their appropriate frequency and wavelength.

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Recall th e D o p p l er Effect A receding source yields a red-shifted wave, and an approaching source yields a blue-shifted wave. A source passing by emits blue- then red- shifted waves.
The Relativistic Doppler Effect So what happens when we throw in Relativity? Consider a source of light (for example, a star) in system K receding from a receiver (an astronomer) in system K with a relative velocity v . Suppose that (in the observer frame) the source emits

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## This note was uploaded on 04/23/2011 for the course PHYS 342 taught by Professor Staff during the Spring '08 term at Purdue.

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Manfra9 - Course Business PHYS342 Lecture 9 3nd problem set...

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