Light of which of the following colours will have the maximum energy in a photon associated with it?

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:

$\lambda$ = wavelength

$h$ = Planck’s constant

$\nu$ = 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