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A vehicle, with a horn of frequency \( n \) is moving with a velocity of \( 30 \mathrm{~m} / \mathrm{s} \) in a direction \( \mathrm{P} \) perpendicular to the straight line joining the W. observer and the vehicle. The observer perceives the sound to have a frequency \( \left(n+n_{1}\right) \). If the sound velocity in air is \( 300 \mathrm{~m} / \mathrm{s} \), then
(1) \( n_{1}=10 n \)
(2) \( n_{1}=0 \)
(3) \( n_{1}=0.1 n \)
(4) \( n_{1}=-0.1 n \)
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