Main Features of Photons

Main Features of Photons:

Electromagnetic radiations (like light waves, radio waves etc.) carry energy in packets or bundles known as Photons or Quanta. The main features of Photons are as under-

1:- Photons travel in a straight line.

2:- The energy of the Photon is given by-

E = hν = hc/λ

Where ‘h’ is Planck’s constant and its value is 6.62 x 10-34 Js, ‘ν’ is the frequency of Photon, ‘λ’ is the wavelength of Photon and ‘C’ is the velocity of light.

3:- All Photons travel in space with the same speed (equal to the speed of light).

4:- Photons are electrically neutral.

5:- The energy of the Photon is usually expressed in electron-volt where-

1ev = 1.6 x 10-19 J

6:- Photons are not deflected by electric and magnetic fields.

7:- The momentum of the Photon is given by-

mc = h/λ

8:- The mass of the Photon is given by-

m = h/cλ

9:- From the theory of relativity-

m = m0/√[1 – (ν’2/c2)]

Where m0 is the rest mass of the particle.

∴ m0 = m √[1 – (ν’2/c2)]
In case of Photon, ν’ ≈ C
⇒ m0 = 0

Hence Photon has zero rest mass. Hence, Photon cannot exist at rest.


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