Q. Please answer the below question.

2. Calculate the energy of a photon of red light having wavelength 650 nm,

3. Calculate the wavelength of the spectral lines of Balmer series when n =3,

4. The energy of the electron in the second and the third orbit of Hydrogen atom is -5.42 x 10-¹² ergs. and -2.41 x 10^-12 ergs, Calculate the wavelength of the emitted radiation when electron drops from 3^rd to 2^nd orbit. 

 

 2.
The frequency f, the wavelength λ and the speed  c of all electromagnetic radiations are related by the equation

c = fλ

hence making f the subject of formula

f =c/λ

Calculating f

f = 3.0 x 10⁸ /650 x 10^-9

= 4.6 x 10¹⁴ Hz

Calculating the energy of the photon using the equation E = hf

Energy E = 6.63 x 10^-34 * 4.6 x 10¹⁴

                     =3.0 x10^-19 J

E = 3.0 x10^-19 J

= 3.0 x10^-19 /1.6 x10^-19

= 1.9 eV

for remaining query please ask in separate thread.

Regards,