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SVETLANKA909090 [29]
2 years ago
13

17. A microphone of surface area 2.0 cm’ absorbs 1.1 mW of sound. What is the intensity

Physics
1 answer:
Oxana [17]2 years ago
3 0

Answer:

I=0.055\ W/m^2

Explanation:

Given that,

A microphone of surface area 2.0 cm’ absorbs 1.1 mW of sound.

Surfrace area, A = 2 cm = 0.02 m

Power absorbed, P = 1.1 mW = 0.0011 W

We need to find the intensity of sound hitting the microphone. Power per unit area is called the intensity of sound. It can be given by :

I=\dfrac{P}{A}\\\\=\dfrac{0.0011\ W}{0.02\ m^2}\\\\=0.055\ W/m^2

So, the intensity of sound is 0.055\ W/m^2. Hence, the correct option is (b).

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