Question

What is the energy in joules, required to shift the electron of the hydrogen als
series of atomic hydrogen.
from the first Bohr orbit to the fifth Bohr orbit and what is the wavelength of
light emitted when the electron returns to the ground state? The ground st
electron energy is -2.18 x 10ergs.
in hydrogen atom is niven by F = (-2.18 x 10-18)/nº J.
​

Answer 1

Answer:

b.

Explanation:

Correct option is

B

K and Li

Wavelength λ=400 nm =400×10

−9

m.

Energy of photon E=

λ

hC

E=

400×10

−9

m

6.626×10

−34

Js×3×10

8

m/s

E=4.97×10

−19

J

Convert the unit into electron volts

E=4.97×10

−19

J×

1.6×10

−19

J

1eV

E=3.1eV.

K and Li will emit photoelectrons as their threshold energy (obtained from graph) is less than 3.1 eV.