The loudspeakers 
and 
driven by a common oscillator and amplifier are set-up as shown in the figure. As the frequency of the oscillator increases from zero, the detector at 
recorded a series of maximum and minimum signals. What is the frequency at which the first maximum is observed? (Speed of sound 
)
Text Solution
Verified by ExpertsThe correct answer is:
B
We have, 
Path difference, 
For maximum, 
For 
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