A student holds a tuning fork oscillating at 256 Hz. He walks toward a wall at a constant speed of 1.09 m/s. (a) What beat frequency does he observe between the tuning fork and its echo? ?Hz (b) How fast must he walk away from the wall to observe a beat frequency of 6.00 Hz? ?m/s

Principles of Physics: A Calculus-Based Text
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Chapter14: Superposition And Standing Waves
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A student holds a tuning fork oscillating at 256 Hz. He walks toward a wall at a constant speed of 1.09 m/s.

(a) What beat frequency does he observe between the tuning fork and its echo?
 ?Hz

(b) How fast must he walk away from the wall to observe a beat frequency of 6.00 Hz?
 ?m/s
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