Question

according to bohr's theory the electronic energy of hydrogen atom in the nth bohr's orbit is given by En=-21.76*10^-19/n^2 J calculate the longest wavelength of light that will be needed to remove an electron from the 3rd orbit of an He+ atom?

Answer 1

@Frostbite

Answer 2

You know the Bohr frequency condition?
\[\large \Delta E = h f\]
Delta E is the energy difference between the shells
\[\large E_{2}-E _{1}=hf\]
Use the formula given to calculate the 3. orbital energy.

Answer 3

And 1. orbital energy too.

Answer 4

and what about the wavelength? @Frostbite

Answer 5

Use wave theory:
\[\large f=\frac{ c }{ \lambda }\]
c is the speed of light.

Answer 6

OKK!

Answer 7

Sorry not meant like that :)

Answer 8

OKk bro thanx then i will solve it tomorrow cz now i m going 4 a sleep

Answer 9

Sweet dreams.