Light of which of the following colours will have the maximum energy in a photon associated with it?
(A) Red light
(B) Yellow light
(C) Green light
(D) Blue light
The energy of a photon is given by:
Where:
= wavelength
= Planck’s constant
= frequency
Photon energy is directly proportional to frequency and inversely proportional to wavelength.
In the visible spectrum:
- Red light → longest wavelength → lowest energy
- Yellow light → shorter than red
- Green light → shorter than yellow
- Blue light → shortest wavelength (among the options) → highest frequency → highest energy
Therefore, the correct answer is:
(D) Blue light
