A vehicle, with a horn of frequency , is moving with a velocity of in a direction…

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

Problem

A vehicle, with a horn of frequency

n

, is moving with a velocity of

30\ \text{m s}^{-1}

in a direction perpendicular to the straight line joining the observer and the vehicle. The observer perceives the sound to have a frequency

(n+n_1)

. If the sound velocity in air is

300\ \text{m s}^{-1}

, then (1)

n_1=10n

(2)

n_1=0

(3)

n_1=0.1n

(4)

n_1=-0.1n