1. How is the frequency of a vibrating obect ? How is it related to shrillness of sound ?

2. Ramesh measured the time gap between lightning and thunder, and found that it was 3 seconds. Assuming light covers the distance instantly, what is the distance of the clouds from Ramesh.

(1)

Frequency can be defined at the  number of vibrations produced in an object in one second. The shrillness or pitch of sound is directly related tot he frequency of the vibrating object.

(2)

here,

 time taken, t = 3 secs.

speed of sound, s = 340 m/s

so, the distance of the clouds would be

d = t x s = 340 X 3

or

d =  1020 m