A Source Emitting Waves of Constant Wavelength Approaches an Observer

question 29

Multiple Choice

A source emitting waves of constant wavelength approaches an observer, then passes the observer, and recedes into the distance-all at a constant speed. The wavelength of the waves the observer measures from this source

• A) remains constant.
• B) gradually becomes longer and longer as the source approaches the observer and then becomes even longer as the source recedes from the observer.
• C) gradually becomes shorter and shorter as the source approaches the observer and then gradually becomes longer and longer as the source recedes from the observer.
• D) is shorter (and constant) as the source approaches the observer and then suddenly becomes longer (and constant) as the source recedes from the observer.

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Definitions:

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