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Question

Physics Question on sound

The intensity of sound from a radio at a distance of 22 meters from its speaker is 1×10−2μW/m21 \times 10^{-2} \mu W/m^2. The intensity at a distance of 1010 meters would be

A

0.2×10−2 μW/m20.2\times 10^{-2} \,\mu W/m^2

B

1×10−2 μW/m21\times 10^{-2} \,\mu W/m^2

C

4×10−4 μW/m24\times 10^{-4} \,\mu W/m^2

D

5×10−2 μW/m25\times 10^{-2} \,\mu W/m^2

Answer

4×10−4 μW/m24\times 10^{-4} \,\mu W/m^2

Explanation

Solution

Answer (c) 4×10−4 μW/m24\times 10^{-4} \,\mu W/m^2