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Beats: Two Motors in a Factory Are Running at Slightly

Question 93

Multiple Choice

Beats: Two motors in a factory are running at slightly different rates. One runs at 825 rpm and the other at 786 rpm. You hear the sound intensity increase and then decrease periodically due to wave interference. How much time elapses between successive maxima of the sound intensity?


A) 1.5 s
B) 1.4 s
C) 1.7 s
D) 1.8 s

Correct Answer:

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