Question

A photon of frequency 3Rc/4cannot be emitted from which of the following transitions:(Given: R = Rydberg's constant, c = speed of light)(A) From 5 upto 1 transition in a sample of H-atom.(B) From 6 upto 1 transition in a sample of He ion.(C) From 7 upto 3 transition in a sample of Lil+ ion.(D) From 8 upto 3 transition in a sample of He ion.​

Answer 1

Answer:

Wavelength of photon emitted due to electronic transition from n

1

=3 to n

2

=2 of hydrogen atom

λ

1

=R(

n

2

2

1

−

n

1

2

1

)

∴

λ

1

=R(

2

2

1

−

3

2

1

) ⟹λ=

5R

36

Thus frequency of photon ν=

λ

C

=

36

5RC