Question:
It is noticed that a sharp tap made in front of stone steps give rise to a ringing sound assuming that each step is 0.25m deep. Estimate the frequency of the sound.(The vel of sound=340m/s)
Solution:
The echo from the steps is in phase with the original sound. So the steps must be 1/2 wavelength
deep, and the reflected sound
is then in phase with the incoming sound, and the wavelength is .5 m,
f = 340/.5 = 680 / sec
Video solution: