A musician using an open flute of length 50 cm produces second harmonic sound waves. A person runs towards the musician from another end of a hall at a speed of 10 km h - 1 . If the wave speed is 330 m s - 1 , the frequency heard by the running person shall be close to

Question

A musician using an open flute of length 50 cm produces second harmonic sound waves. A person runs towards the musician from another end of a hall at a speed of 10 km h - 1 . If the wave speed is 330 m s - 1 , the frequency heard by the running person shall be close to, 333 Hz, 500 Hz, 666 Hz, 753 Hz

MARKS App · Accepted Answer

Frequency of the observer, f o = 2 × v 2 l = 330 0.5 Hz = 660 Hz Velocity of person = 10 km h - 1 = 10 × 5 18 m s - 1 = 2.8 m s - 1 According to Doppler effect, frequency heard by the person, f = f o v + v 0 v f = 660 × 330 + 2.8 330 Hz = 666 Hz

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