Applied Physics I: Chapter 7: Quantum Mechanics
Photon and its properties
According to the Quantum theory of radiation, we know that the exchange of energy values between the light radiation and particles have discrete energy values.
PHOTON AND ITS
PROPERTIES
According
to the Quantum theory of radiation, we know that the exchange of energy values
between the light radiation and particles have discrete energy values.
Photon
The
discrete energy values in the form of small packets (or) bundles (or) quantas
of definite frequency or wavelength are called photons. These photons
propagates like a particle but with the speed of light (3 × 108
m/s).
Properties of Photon
(i)
Photons are similar to that of electrons.
(ii)
We know for electrons the definite quantities are ‘e' and ‘m'. Similarly for
photons the definite quantities are 'h' and 'c'.
(iii)
Photons will not have any charge. They are neutral and hence they are not
affected by magnetic (or) electric fields.
(iv)
They do not ionise gases.
(v)
The energy of the photon is given by E=hv,
which varies with respect to the type of radiation frequencies.
(vi)
The momentum of a photon is given by p=mc,
where 'm' is the mass of the photon
and c is the velocity of light.
(vii)
The relation between energy and the momentum of the photon is given by E=pc. [ E=mc2 ⇒ mc (c) ⇒ pc where momentum p =
mc ]
Applied Physics I: Chapter 7: Quantum Mechanics : Tag: Applied Physics : - Photon and its properties
Applied Physics I: Chapter 7: Quantum Mechanics
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