A person walks straight toward a large wall at while blowing a whistle of unknown…
PHYSICS · Subjective · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics
Problem
A person walks straight toward a large wall at 2m s−1 while blowing a whistle of unknown frequency. He hears 4 beats per second between the direct sound and the echo reflected from the wall. Assuming the speed of sound in air is 340m s−1, calculate the frequency of the whistle.