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. 1.8 × 10–4 W/m2

Step-by-step explanation:

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Answer 2

The intensity of the sound wave is defined as the ratio between the power of the wave and the area through which the wave passes:

`I= (P)/(A)`
where
I is the intensity
P is the power
A is the area

If we use the data of the problem,
`P=8.8 \cdot 10^(-4)W` and
`A=5.0 m^2`, we find the intensity of the sound wave:

`I= (P)/(A)= (8.8 \cdot 10^(-4) W)/(5.0 m^2)=1.76 \cdot 10^(-4) W/m^2`