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A sound sources, detector and a movable wall are arranged as shown in figure. In this arrangement detectir us detacting the maximum intensity. If the speed of sound is `330 m//s` in air and frequency of source is `660 Hz`, then find the minimum distance by which the wall should be moved away from source, so that detector dtects minimmum intensity.

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Verified by Experts

The correct Answer is:
`12.5 cm`

Let `SO + OD - SD = n lambda`…….`I` , constructive interference
`rArr SP + PD - SD = n lambda`……….. `II` , destructive interference
`II - I` gives
`SP - SO + PD - OD = (lambda)/(2)`
`OP + OP = (lambda)/(2)`
`OP = (lambda)/(4) - (v)/(f) = (1)/(4) (330)/(660) = 0.125 m = 12.5 cm`
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RESONANCE ENGLISH-SOUND WAVES-Exercise- 1 PART - I
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  9. The speed of sound in an air column of 80 cm closed at one end is 320 ...

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  10. In an organ pipe the distance between the adjacent node is 4 cm. Find ...

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  11. Two pipes P(1) and P(2) are closed and open respectively. P(1) has a l...

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  12. Two successive resonance frequencies in an open organ pipe are 1944 Hz...

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  13. A closed organ pipe of length l = 100 cm is cut into two unequal piece...

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  14. Find the number of possible natural oscillations of air column in a pi...

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  15. A source of sound with adjustable frequency produces 2 . beats per sec...

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  16. Two indentical piano wires, kept under the same tension T have a fund...

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  17. A metal wire of diameter 1 mm is held on two knife edges by a distance...

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  18. A string 25 cm long and having a mass of 2.5 g is under tension. A pip...

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