Increasing the brightness of a beam of light without changing its color will increase
A) the number of photons per second traveling in the beam.
B) the wavelength of the photons.
C) the energy of each photon.
D) the frequency of the light.
E) the speed of the photons.

Question

Quizplus · Accepted Answer

Increasing the brightness of a beam of light involves increasing the number of photons per second, as brightness is related to the intensity or the amount of energy the light beam carries per unit time. The color of the light, which is determined by the frequency (and thus the energy) of the photons, remains unchanged, indicating that the energy of each photon and the frequency of the light do not change. The speed of light in a vacuum is constant, and the wavelength is directly related to the frequency, which also remains unchanged.

Increasing the Brightness of a Beam of Light Without Changing