Question

A source of sound of frequency 500 Hz is moving towards an observer with velocity 30 m/s. The speed of the sound is 330 m/s. The frequency heard by the observer will be

• A. 550 Hz
• B. 458.3 Hz
• C. 530 Hz
• D. 545.5 Hz

Answer 1

Answer: (A)

550 Hz

Answer 2

$n' = \frac{v}{v - v_{s}}.n$ ⇒ $n' = \frac{330}{330 - 30}.500$⇒ n' = 550

Hz