Question

A sound wave causes the density of air at a place to oscillate 1200 times in 2 minutes. Find the time period and frequency of the wave.

Answer 1

Number of oscillations = 1200
Time taken = 2 min = 120 sec

Time period = 120/1200 = 0.1 sec

Frequency = 1/T = 1/0.1 = 10 Hz

Answer 2

Number of oscillations = 1200

Time taken = 2 min = 120 sec

Time period = 120/1200 = 1/10

Frequency = 1/T = 1/0.1 = 10 Hz

Hope this helps