A source of sound S and a detector D are...

A source of sound S and a detector D are placed at some distance from one another. A big cardboard is placed near the detector and perpendicular to the line SD as shown in figure. It is gradually moved away and it is found that the intensity changes from a maximum to a minimum as the board is moved through a distance of 20 cm. Find the frequency of the sound emitted. Velocity of sound in air is `336 m s^-1`.

420 Hz

440 Hz

336 Hz

340 Hz

Text Solution

Verified by Experts

The correct Answer is:

According to the given data, `v=336 m/s`
`lamda/4=` distance between maximum and minimum intensity `=20cm`
`implieslamda=80 cm`
`impliesn=frequency =v/lamda`
`=336/80*10^2=420Hz`

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