A sound source is moving with speed \( 5 \mathrm{~m} / \mathrm{s} \) towards ( W a wall. If the ...

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A sound source is moving with speed \( 5 \mathrm{~m} / \mathrm{s} \) towards
( W
a wall. If the velocity of sound is \( 330 \mathrm{~m} / \mathrm{s} \) the stationary observer would hear beats is equal to(frequency of source \( =240 \mathrm{~Hz} \) ) -
(1) 0
(2) 0 or 8
(3) 8
(4) 0 or 4
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