Question

A sound wave with an intensity of 70 W/cm^2 strikes a boundary, and 10% is reflected. What is the reflected intensity?

a) 7 W/cm^2
b) 14 W/cm^2
c) 21 W/cm^2
d) 49 W/cm^2

Answer 1

The reflected intensity is 7 W/cm^2.

Step-by-step explanation:

To calculate the reflected intensity, we need to multiply the initial intensity by the reflection coefficient. The reflection coefficient is equal to 10% or 0.1. So, the reflected intensity is 0.1 * 70 W/cm^2 = 7 W/cm^2.