Question

Calculate the energy of the photon of the radiaiton having wave length 100nm.

Answer 1

Dear Student,

Energy of Photon = hc/λ ............(1)
where [ h = plancks constant = 6.6 x 10^-34 Jsec] and [ c = speed of light = 3 x 10 ⁸ m/sec]
Now the wavelength of light given = 100 nm = 100 x 10^-9 m
Putting all the values in equation ....(1)
E = (6.6 x 10^-34 x 3 x 10⁸ )/ 10^-7 = 19.8 x 10^-19 J = 1.98 x 10^-18 J

So the energy associated with the photon = 1.98 x 10 ^-18 J

Regards.