What happens to the power if the intensity is doubled?

• A. No change
• B. It doubles
• C. It quadruples
• D. It is halved

Answer: (B)

The power of a wave is related to its intensity through the area over which the wave is distributed. Intensity, defined as power per unit area, indicates how much power is transmitted through a specific area. When the intensity is doubled, for a fixed area, it implies that more energy is being transmitted through that area within the same amount of time.

Since power is the product of intensity and area, if the intensity is increased twofold and the area remains constant, the total power must also increase by the same factor. Therefore, if the intensity is doubled, the power will also double, demonstrating a direct linear relationship between power and intensity, assuming the area does not change.