A source of sound S and a detector D are placed at some distance from...

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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 16 E1 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

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