A listener is at rest with respect to the source of sound. A wind starts blowing along the line ...

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A listener is at rest with respect to the source of sound. A wind starts blowing along the line
\( P \) joining the source and the observer. Which of the following quantities do not change as
W observed by observer ?
(1) Frequency
(2) Velocity of sound
(3) Wavelength
(4) All of these
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