Two sources of sound \( A \) and \( B \) produce the wave of \( 350 \mathrm{~Hz} \), in the same...

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Two sources of sound \( A \) and \( B \) produce the wave of \( 350 \mathrm{~Hz} \), in the same phase. A particle \( P \) is vibrating under the influence of these two waves, if the amplitudes at the point \( P \) produces by the two waves is \( 0.3 \mathrm{~mm} \) and \( 0.4 \mathrm{~mm} \), then the resultant amplitude of the point \( P \) will be, when \( A P-B P=25 \mathrm{~cm} \). Velocity of sound is \( 350 \mathrm{~m} / \mathrm{s} \).
(a) \( 0.7 \mathrm{~mm} \)
(b) \( 0.1 \mathrm{~mm} \)
(c) \( 0.2 \mathrm{~mm} \)
(d) \( 0.5 \mathrm{~mm} \)
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