A small speaker delivers 2 W of audio output

PHYSICS · Single correct · CBSE · Physics · Sound · Sound

Problem

A small speaker delivers 2 W of audio output. At what distance from the speaker will one detect 120 dB intensity sound? [Given reference intensity of sound as 10−12 W/m210^{-12} \text{ W/m}^2] (1) 40 cm (2) 20 cm (3) 10 cm (4) 30 cm

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