Question

question 4
which of the following colors of light has the greatest energy per photon?
a. red light.
b. green light.
c. yellow light.
d. blue light.

Explanation:

The energy of a photon is given by $E = h
u$, where $h$ is Planck's constant and $
u$ is the frequency. Blue light has the highest frequency among red, green, yellow and blue light in the visible - light spectrum. Higher frequency means higher energy per photon.

Answer:

D. Blue light