PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation
Problem
18. Two monochromatic light beams, one red and one green, have the same intensity and the same cross sectional area. How does the energy of each photon and the number of photons crossing a unit area per second in the red beam compare with those of the green beam?
Energy of Photon Number of Photons Crossing Unit Area per Second
(A) Greater for red Less for red
(B) Greater for red Greater for red
(C) Less for red Less for red
(D) Less for red Greater for red