Question

if the speed of a wave in air 400 m/s and time period of the oscillation is 10 mili second. Find it's frequency and wavelength

Answer 1

Given, v = 400 m/s
T = 10 millisecond = 0.01 s
Since, frequency, $\nu$= 1/T = 1/0.01 = 100 Hertz
Since, v = ​ $\nu$ λ
hence, wavelength ​ λ = v/​$\nu$ = 400/100 = 4 m