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A source oscillates with a frequency \( 25 \mathrm{~Hz} \) and the
\( \mathrm{P} \) wave propagates with \( 300 \mathrm{~m} / \mathrm{s} \). Two points \( A \) and \( B \) are located at distances \( 10 \mathrm{~m} \) and \( 16 \mathrm{~m} \) away
W from the source. The phase difference between \( A \) and \( B \) is
(1) \( \frac{\pi}{4} \)
(2) \( \frac{\pi}{2} \)
(3) \( \pi \)
(4) \( 2 \pi \)
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