A small speaker delivers 2W of audio output. At what distance from the speaker will one detect 120 DB intensity sound?
[Given reference intensity of sound as
40 cm
20 cm
10 cm
30 cm
Sound level in decibels -
- wherein
Where is the intensity of the sound and is a constant reference intensity = 10-12 W/m2
And we know
so
Option 1)
40 cm
Option 2)
20 cm
Option 3)
10 cm
Option 4)
30 cm
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