Question

1. A sound wave has a frequency of 5000Hz and wave length of 20cm .how long will it take to travel 1Km.

Answer 1

speed of sound= frequency* wavelength

= 5000* 20

= 100000 m/s

Now,time taken to travel 1km with this speed..

change this speed into km/s..
100000m/ 1s
= 100km/s
Now,time taken= 1/100= 0.01s.