Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of 32 cm and the other of 32.2 cm. The speed of sound in air is `350 ms^-1`.

Answer

C, D

Explanation

Group I,
Given `V=350, I_1=32cm =32x10^-2m`
So `eta_1 =frequency`
350/(32xx10^-2)=1093Hz`
Group II
`V=350, lamda_2=32.2cm`
`=32.2xx10^-2m`
`eta_2=350/(32.2xx10^-2)`
`=1086Hz`
So, beat frequency =1093=7Hz