Question

A sound wave with a power of 8.8 × 10–4 W leaves a speaker and passes through section A, which has an area of 5.0 m2. What is the intensity of sound in this area? (Intensity = I = ) 1.8 × 10–4 W/m2 1.8 × 10–6 W/m2 1.6 × 10–4 W/m2 1.6 × 10–6 W/m2

Answer 1

A is the correct answer

Step-by-step explanation:

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Answer 2

`1.8\cdot 10^(-4) W/m^2`

Step-by-step explanation:

The intensity of the sound wave is given by

`I=(P)/(A)`

where

P is the power

A is the area considered

In this problem, we have

`P=8.8\cdot 10^(-4) W`

`A=5.0 m^2`

Substituting into the formula, we find the intensity:

`I=(8.8\cdot 10^(-4) W)/(5.0 m^2)=1.8\cdot 10^(-4) W/m^2`