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 energy of each photon.
C)the speed of the photons.
D)the frequency of the light.
E)the wavelength of the photons.

Question

Quizplus · Accepted Answer

Increasing the brightness of a beam of light means increasing the intensity of the light, which can be achieved by increasing the number of photons per second in the beam without changing its color (i.e., frequency or wavelength). Therefore, choice A is the correct answer. Increasing the energy of each photon would change the color of the light (higher energy photons correspond to higher frequencies) and increasing the speed of photons is not possible without changing the medium through which they travel.

Increasing the Brightness of a Beam of Light Without Changing