A boy sitting on a swing blows a whistle at a frequency of 1300 Hz and the swing of length 2.5m is moving with an angular amplitude 60∘. The maximum frequency of sound heard by a girl standing infront of the swing is (V = 330 m/s and g = 10 m/s2)

Vs=2gl(1−cos60°)=glVs=5m/sn1=vv−vs.n=340340−5×1300≃1320 Hz

A boy sitting on a swing blows a whistle at a frequency of 1300 Hz and the swing of length 2.5m is moving with an angular amplitude 60∘. The maximum frequency of sound heard by a girl standing infront of the swing is (V = 330 m/s and g = 10 m/s2)

Vs=2gl(1−cos60°)=glVs=5m/sn1=vv−vs.n=340340−5×1300≃1320 Hz

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A boy sitting on a swing blows a whistle at a frequency of 1300 Hz and the swing of length 2.5m is moving with an angular amplitude $60^{\circ}$ . The maximum frequency of sound heard by a girl standing infront of the swing is $({V = 330 m/s and g = 10 m/s}^{2})$

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1305 Hz

1310 Hz

1320 Hz

1300 Hz

answer is D.

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$V_{s} = \sqrt{2 g l (1 - \cos 60 °)} = \sqrt{g l}$

$V_{s} = 5 m / s$

$n^{1} = \frac{v}{v - v_{s}} . n = \frac{340}{340 - 5} \times 1300 ≃ 1320 H z$

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A boy sitting on a swing blows a whistle at a frequency of 1300 Hz and the swing of length 2.5m is moving with an angular amplitude 60∘. The maximum frequency of sound heard by a girl standing infront of the swing is (V = 330 m/s and g = 10 m/s2)

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A boy sitting on a swing blows a whistle at a frequency of 1300 Hz and the swing of length 2.5m is moving with an angular amplitude $60^{\circ}$ . The maximum frequency of sound heard by a girl standing infront of the swing is $({V = 330 m/s and g = 10 m/s}^{2})$