Question

A source of frequency 150 Hz is moving in the direction of a person with a velocity of 110 m/s. The frequency heard by the person will be (speed of sound in medium = 330 m/s)

• A. 225 Hz
• B. 200 Hz
• C. 150 Hz
• D. 100 Hz

Answer 1

Answer: (A)

225 Hz

Answer 2

$n' = \frac{v}{v - v_{s}} \times n = \left( \frac{330}{330 - 110} \right) \times 150 = 225Hz$