Physics, 22.03.2021 14:40 yurrr30

Two loudspeakers L, and L2 driven from a common oscillator are arranged as shown in the diagram. A detector is placed at D. It is found that, as the frequency of the oscillator
is gradually changed from 200 Hz to 1000 Hz the detected signal passes through a series
of maxima and minima.

(a) Explain why this is so.
(b) Calculate the frequency at which the first
minimum above 200 Hz is observed.
D

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