A Sound Source of Frequency F Moves with Constant Velocity

question 97

Multiple Choice

A sound source of frequency f moves with constant velocity (less than the speed of sound) through a medium that is at rest.A stationary observer hears a sound whose frequency is appreciably different from f because

• A)the equation that relates velocity of propagation,frequency,and wavelength of a sound traveling through a medium does not apply in this situation.
• B)the sound wave travels through the medium with a velocity different from that which it would have if the source were at rest.
• C)the frequency of the source is changed because of its motion.
• D)the wavelength established in the medium is not the same as it would be if the source were at rest.
• E)interference effects set up a standing-wave pattern that alters the frequency.

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