The formula to calculate the intensity is:
\[ I = \frac{P}{4 \pi r^2} \]
Where:
Intensity is defined as the power per unit area contained by a wave. It measures the amount of energy that a wave carries through a unit area per unit time. This concept is commonly used in various fields, including physics, acoustics, and electromagnetism, to describe the strength of waves such as light, sound, and electromagnetic radiation.
Let's assume the following values:
Using the formula to calculate the intensity:
\[ I = \frac{100}{4 \pi (2)^2} \]
Calculating the denominator:
\[ 4 \pi (2)^2 = 4 \pi \cdot 4 = 16 \pi \]
Therefore:
\[ I = \frac{100}{16 \pi} \approx \frac{100}{50.2655} \approx 1.99 \text{ W/m²} \]
The Intensity is approximately 1.99 W/m².