A train approaching a hill at a speed of 40 km/hr sounds a whistle of frequency 580 Hz…
Physics · JEE Advanced · NTA Exams — Oscillations and Waves
A train approaching a hill at a speed of 40 km/hr sounds a whistle of frequency 580 Hz when it is at a distance of 1 km from the hill. A wind with a speed of 40 km/hr is blowing in the direction of motion of train.
Velocity of sound = 1200 km/hr.
What is the frequency heard by the driver?
- 620 Hz
- 630 Hz
- 650 Hz
- 640 Hz
Answer
(A) 620 Hz
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