# Whenever a Photon is Emitted by Hydrogen in Balmer Series, It is Followed by Another Photon in Lyman Series. What Wavelength Does this Latter Photon Correspond To? - Physics

Sum

Whenever a photon is emitted by hydrogen in Balmer series, it is followed by another photon in Lyman series. What wavelength does this latter photon correspond to?

#### Solution

As the second photon emitted lies in the Lyman series, the transition will be from the states having quantum numbers n = 2 to n = 1.
Wavelength of radiation (lamda) is given by

1/lamda = R (1/n_1^2 - 1/n_2^2)

Here, R is the Rydberg constant, having the value of 1.097×107 m-1.

1/lamda = 1.097 xx 10^7 [1/(1)^2 - 1/(2)^2]

1/lamda = 1.097xx10^7 [1 - 1/4]

rArr 1/lamda = 1.097 xx 3/4 xx 10^7

rArr lamda = 4/(1.097xx3xx10^7)

=1.215xx10^-7

= 121.5 xx 10^-9 = 122  nm

Concept: The Line Spectra of the Hydrogen Atom
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#### APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 21 Bohr’s Model and Physics of Atom
Q 13 | Page 384