Question

from ncert textbook class 8th ch_13(Sound)​

Answer 1

Explanation:

Time period is time taken to complete one oscillation.

so, time taken to complete 1 oscillation= 4/40

= 0.1 sec

Frequency is number of oscillation in 1 second.

so, it is 40/4

= 10

hope it helps ......✌✌

Answer 2

Answer:

40/4=10

ans 10

tnx