A plane progressive wave of frequency \( 25 \mathrm{~Hz} \), amplitude \( 2.5 \times 10^{-5} \ma...

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A plane progressive wave of frequency \( 25 \mathrm{~Hz} \), amplitude \( 2.5 \times 10^{-5} \mathrm{~m} \) and initial phase is zero moves along the negative \( x \) direction with a velocity of \( 300 \mathrm{~m} / \mathrm{s} . A \) and \( B \) are two points \( 6 \mathrm{~m} \) apart on the line of propagation of the wave. At any instant the phase difference between \( A \) and \( B \) is \( \phi \). The maximum difference in the displacement at \( A \) and \( B \) is \( \Delta \). Then,
(A) \( \phi=\pi \)
(B) \( \Delta=0 \)
(C) \( \phi=0 \)
(D) \( \Delta=5 \times 10^{-5} \mathrm{~m} \)
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