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Q. At some automobile toll-collecting stations, the thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the reason of this wire?

Q. At a distance of 4.32m from a siren, the sound intensity is 3.75 x 10-2 W/m2. Assume that the siren radiates sound uniformly in all directions; find out the total power radiated.

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