Application of Quantum theory:
(i) In 1905, Einstein applied this theory to explain the photoelectric effect.
(ii) In 1913, N. Bohr used this theory to explain the structure of atoms and explain hydrogen spectra.
(iii) In 1922, this theory was used to explain Compton effect.
Energy (E) of one photon = hv = ...(1)
Here
Substituting the values in eq. (1), we have
A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.
Power of the bulb = 100 watt
= 100 Js-1
Energy of one photon E = hv =
Calcualte the energy of one mole of photons of radiation whose frequency is 5 x 1014Hz.
Energy (E) of one photon = hv
Here, h = 6.626 x 10-34 Js
v = 5 x 1014 s-1
Here,
According to Planck's quantum theory,
....(1)
Substituting the value in (1),