Question

unit 7 \physical interaction\ test
the brightness of light is determined by _____.
intensity of light waves.
wave speed
wavelength
air temperature

Explanation:

The brightness of light is related to the amount of energy it carries per unit area per unit time, which is the intensity of light - waves. Wave speed is a constant in a given medium for light in vacuum or air (approx. $c = 3\times10^{8}m/s$), wavelength determines the color of light, and air - temperature has no direct relation to light brightness.

Answer:

intensity of light waves.