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 distance from the hill at which the echo from the hill is heard by the driver?
- \(\frac{15}{16} \mathrm{~km}\)
- \(\frac{20}{31} \mathrm{~km}\)
- \(\frac{17}{18} \mathrm{~km}\)
- \(\frac{29}{30} \mathrm{~km}\)
Answer
(D) 29 30 ~km
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