A whistle produces a sound of 1.00 kHz while moving at 20 m/s in still air directly…

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

Problem

A whistle produces a sound of 1.00 kHz while moving at 20 m/s in still air directly toward a stationary listener. The speed of sound in air is 340 m/s. What is the best estimate of the frequency the listener detects? (a)

9.4 \times 10^{2}\ \text{Hz}

(b)

1.06 \times 10^{3}\ \text{Hz}

(c)

1.12 \times 10^{3}\ \text{Hz}

(d)

1.00 \times 10^{3}\ \text{Hz}

Related theory

Doppler Effect
The Doppler effect

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