While testing speakers for a concert, Thomas sets up two speakers to produce sou

Question

While testing speakers for a concert, Thomas sets up two speakers to produce sound waves at the
same frequency, which is between 100 Hz and 150 Hz. The two speakers vibrate in phase with one
another. He notices that when he listens at certain locations, the sound is very soft (a minimum
intensity compared to nearby points). One such point is 25.8 m from one speaker and 37.1 m from
the other. What are the possible frequencies of the sound waves coming from the speakers? (The
speed of sound in air is 343 m/s.)
a. 123 Hz and 146 Hz b. 112 Hz and 124 Hz
c. 101 Hz and 149 Hz d. 124 Hz and 145 Hz
e. 106 Hz and 137 Hz

Explanation / Answer

b. 112 Hz and 124 Hz

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