Question

If the power in a beam is 1 watt and the area is 5 cm squared, what is the beam's intensity?

A. 5 W/cm^2.
B. 1 W/cm^2.
C. 0.2 W/cm^2.
D. 1 watt.

Answer 1

The intensity of the beam is 200 W/m².

Step-by-step explanation:

The intensity of a beam is the power per unit area.

To calculate the intensity, we need to divide the power of the beam by the area it covers.

In this case, the power of the beam is 1 watt, and the area is 5 cm². To convert the area to square meters, we need to divide it by 10000.

So, the intensity is 1 / (5 / 10000) = 200 W/m².

Therefore, the correct answer is 200 W/m² (option C).