Two earthquake waves of the same frequency travel through the same portion of the Earth, but one...

Question:

Intensity and Energy:

The intensity of a wave directly varies with the power of the wave. As we know that, power is the ratio of energy and time. Thus, the power directly varies with the energy, and energy directly varies with the intensity of the wave. The expression for finding the intensity of a spherical wave is:

{eq}I = \dfrac{P}{{4\pi {r^2}}} {/eq}, where:

• r is the radius of the spherical wave.

We know that power is directly proportional to the energy:

{eq}\begin{align*} P &= \dfrac{E}{t}\;\;\;\;\;\;\;\left( {t = time} \right)\\ P &\propto E\\ P &\propto I \propto E \end{align*} {/eq}

Answer and Explanation: 1