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Two identical sound source $S_{1} a n d S_{2}$ emit longitudinal waves having zero phase angles.If their frequency is $10 H z$ and the separation between the sources $Δ x = \frac{1}{4} m$ , the phase difference between the two waves at point P(Assuming P is close to sources) at t=2 sec is (wavelength of waves $λ = 1 m$ )

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$\frac{π}{2}$ if the sources start emitting waves at t=0 sec simultneously

$π$ if the sources start emitting waves at t=0 sec simultneously

$\frac{39 π}{2}$ if $S_{1}$ starts emitting at $t_{1} = 0$ and $S_{2}$ starts emitting at $t_{2} = 1$ sec.

$\frac{41 π}{2}$ if $S_{1}$ starts emitting at $t_{1} = 0$ and $S_{2}$ starts emitting at $t_{2} = 1$ sec.

answer is A, C.

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