Question

The wavelength of a photon is 10A find its energy? 2

Answer 1

Photon energy E = `h.c/lambda` and approx. =0.12 eV

Explanation:

A photon is quanta of light/or electromagnetic waves.

the wavelength of light is related with its frequency

`f= c/lambda`

and the energy of a photon is equal to h.f
therefore the

photon's Energy `E= h.c /lambda`

h=Plank's Constant = 6.63. 10^-34 Js and

c = speed of light =3. 10^8 m/s

`lambda` = 10 `Angstrom` =10 . 10^-10 m

E= 19.89 . 10^-17 Joules

or in eV E =0.12 eV ( as i eV = 1.6. 10^-19 J )