Question

(ii)The wavelength limit of Lyman series is (a) 1215.4 A0 (b) 511.9 An (c) 951.6 Aº (d) 911.6 A​

Answer 1

Answer:

The Lyman limit is the short-wavelength end of the hydrogen Lyman series, at 91.2 nm (912 Å).

Answer 2

Explanation:

Rydberg formula for wavelength for the hydrogen spectrum is given by

λ

1

=R[1/n

1

2

−1/n

2

2

]

For short wavelength of Lyman series,

913.4

1

=R[1/1

2

−1/∞

2

]

or R=(1/913.4)A

−1

For short limit of wavelength for Balmer series,

λ

b

1

=R[1/2

2

−1/∞

2

]

or λ

b

=4/R=4(913.4)=3653.6A

o

=365.36nm