Question

A Sound note is produced by a ringing bell and the echo of the note from a nearby wall is received 0.5secs later. If the frequency of the note is 400hz and its wavelength is 1m. Calculate the distance between the bell and the wall

Answer 1

The speed of wave:

$$v=f\lambda=(400)(1)=400\frac{m}{s}$$

The distance between the bell and the wall

$$d=0.5vT=0.5(400)(0.5)=100\ m$$