A launch sounding its horn of frequency moves with a speed of directly towards a high…
PHYSICS · Subjective · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics
Problem
A launch sounding its horn of frequency 600Hz moves with a speed of 6m s−1 directly towards a high vertical cliff in still air.
(a) Find the frequency of the sound (echo) that returns to the launch after reflection from the cliff and is heard by an observer on the launch.
(b) The observer hears both the direct sound from the horn and the reflected sound. Calculate the beat frequency heard.
(Take the speed of sound in air as 340m s−1.)