If the intensity of sound at a 5 m distance is 50\ \rm{W/m^2}. Calculate the Intensity at a...


If the intensity of sound at a 5 m distance is {eq}50\ \rm{W/m^2} {/eq}. Calculate the Intensity at a distance of 20 m.


In physics, intensity measures the amount of energy per unit of area transversing a surface. The intensity due to a point source is inversely proportional to the squared distance from the source,

{eq}I \propto \dfrac{1}{r^2} {/eq},

presenting spherical symmetry.

Answer and Explanation: 1

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We can establish a rule of three for the intensities at two distances,

{eq}I_1 \propto \dfrac{1}{d_1^2}, \qquad I_2 \propto \dfrac{1}{d_2^2} {/eq}.


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Learn more about this topic:

Intensity in Physics: Definition & Measurement


Chapter 5 / Lesson 10

This lesson explains what wave intensity in physics is, and it explains the intensity of light formula with examples. This lesson also describes how to calculate intensity of sound waves.

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