A whistle of frequency approaches a stationary observer with a speed of

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

A whistle of frequency

450\,\text{Hz}

approaches a stationary observer with a speed of

33\,\text{m s}^{-1}

. The frequency heard by the observer is, taking the speed of sound as

330\,\text{m s}^{-1}

: (1) 409 (2) 429 (3) 517 (4) 500