AP EAMCET · PHYSICS · Waves and Sound
A train approaching a railway crossing at a speed of sounds a whistle of frequency , when it is away from the crossing. The frequency heard by the observer standing on the road perpendicular to the track from the crossing at a distance of is (Speed of sound in air )
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
The figure below represents the observer, train and crossing. The speed of the observer, u=120 cosθ u=120×2883842+2882 u=120×35 km h-1 u=120×35×518 m s-1 u=20 m s-1 The formula for the frequency heard by observer, when…
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