The period of oscillations of a point is \( 0.04 \mathrm{~s} \) and...

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The period of oscillations of a point is \( 0.04 \mathrm{~s} \) and
\( \mathrm{P} \) the velocity of propagation of oscillation is

W \( 300 \mathrm{~m} / \mathrm{s} \). The difference of phases between the oscillations of two points at distance \( 10 \mathrm{~m} \) and \( 16 \mathrm{~m} \) respectively from the source of oscillations is
(1) \( 2 \pi \)
(2) \( \frac{\pi}{2} \)
(3) \( \frac{\pi}{4} \)
(4) \( \pi \)
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