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An athlete is running towards a stationary source of sound with a speed v5,where v is speed of sound in air. Source is emitting a sound of frequency f and wavelength λ. The frequency and wavelength as observed by the athlete are respectively

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a
1.2f,1.2λ
b
0.8f,0.8λ
c
1.2f,λ
d
1.2f,0.8λ

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detailed solution

Correct option is C

fapparent =fv+V/5v=6f5=1.2f  There is no change in wavelength in this case.
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