Question

How can you express the energy of photon?

Answer 1

Energy of a photon:-

• Photon is the quantum of electromagnetic radiation.
• Quantum means to the smallest elementary unit of quantity and one amount of the electromagnetic energy is called a photon.
• Photon can be characterized by either wavelength $\left(\mathrm{\lambda }\right)$ or an equivalent amount of energy$\left(\mathrm{E}\right)$.
• Energy of a photon is given as:

$\mathrm{E}=\frac{\mathrm{hc}}{\mathrm{\lambda }}$

• Here, $\mathrm{E}=$Energy of photon, $\mathrm{h}=$Plank's constant$(6.626\times {10}^{-34}\mathrm{Js})$, $\mathrm{c}=$speed of light$(3\times {10}^8{\mathrm{ms}}^{-1})$, $\mathrm{\lambda }=$wavelength of the light.

Therefore, the energy of a photon can be expressed as $\mathrm{E}=\frac{\mathrm{hc}}{\mathrm{\lambda }}$