Question

The frequency of the first line in the Lyman series in the hydrogen spectrum is v . What is the frequency of the corresponding line in the spectrum of singly-ionized Helium?​

Answer 1

Answer:

Correct option is

B

4γ

we know that frequency=c/λ

but

λ

1

=RZ

2

(1−

2

2

1

) for first line of Lyman series

Here we can see that

λ

1

∝Z

2

For Hydrogen Z

2

=1 and for helium Z

2

=4 so frequency in case of Helium will be four times that is 4γ

Option B is correct.