Photon theory of light (Quantum theory)
(1) Light is made up of particals called photons.These are massless and chargeless particles which travel with speed of light (C=3×10*8m/s in vaccume with respect to any frame of reference.
(2) Rest mass of photons is zero.
Each photon carry definite energy and momentum which is associated with wavelength of light as
(3) Energy of photon(P)=HC/¥ or =hv
h=plank's constant (6.6×10*-34 J.s)
¥= wavelength(lamda)
v=frequency
(4) These may be an interaction between two photon and matter particles.Total energy and momentum are always conserved during the collision 💥 but number of photons may not be conserved during the interaction.
(5) Intensity of light 🕯️ depends on number of photons 🤞 per unit area per second ande energy (hv) of each photon.
I=nhv/A
n=number of photons crossing area per second
hv=energy of each photon.
Some Important values:
v=1/¥
E=hC/¥(in nm) ev =12420 ev/¥
1ev(electron volt) =1.6×10^-19Joule.
☢️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️☢️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️🕯️☢️
