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You stand 25 m from a large speaker at a concert, and the intensity of the...

You stand 25 m from a large speaker at a concert, and the intensity of the sound you hear from that speaker is 4×10−2 W/m2 . How much power is the speaker emitting? I found this one being 314 but i´m getting wrong B What is the intensity of the sound from the speaker at a distance of 50 m ?

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