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Q.

Two persons A and B are on a horizontal ground at a separation of 60m. Person A is blowing a whistle at a frequency of 252 Hz and at the same time he is moving towards B with a velocity of 8.5 m/s. If velocity of sound in air is 340 m/s, the wavelength of sound wave received by B

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a

1.5 m

b

1.315m

c

2.125 m

d

2.2 m

answer is B.

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Detailed Solution

Apparent frequency of sound wave received by B is given by , γ = γo1−vvs = 2521−8.5340 Hz = 258.46Hz ∴ Wavelength = vsv = 340258.46m = 1.315m

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