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SERPSE$1017\mathrm{.}1.$OP$\mathrm{.}004.300Hz.$

$($a$)$ What is the phase difference in radians between the waves from the speakers when they reach the observer? $($Your answer should be between $0$ and $2.)$ rad

$($b$)$ What is the frequency closest to $300Hz$ to which the oscillator may be adjusted such that the observer hears minimal sound?

What is the phase difference when a minimum intensity is heard? $Hz$

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