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

Answer:

$1.8\cdot 10^{-4} W/m^2$

Explanation:

The intensity of the sound wave is given by

$I=\frac{P}{A}$

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:

$I=\frac{8.8\cdot 10^{-4} W}{5.0 m^2}=1.8\cdot 10^{-4} W/m^2$

Answer 2

Answer:

A is the correct answer

Explanation:

I just did the test on edge 2021