Question

· A sample of hydrogen atoms absorbs radiation of
wavelength lambda and consequently emits radiations of six
different wavelengths of which two wavelengths are
shorter than lambda . Choose the incorrect alternative.
(a) The highest orbit occupied by the electron in the fourth orbit
(b) The initial orbit number of the electrons may be 2
(c) The initial orbit number of the electrons may be 3
(d) There are three transitions belonging to Lyman series​

Answer 1

Answer:

Hydrogen atom absorbs radiations of wavelength λ0 and consequently emit radiations of 6 different wavelengths, of which two wavelengths are longer than λ0. Chosses the correct alternative(s).

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Text Solution

the final excited state of the atoms is n=4

the initial state of the atoms may be n=2

the initial state of the atoms may be n=3

there are three transitions belonging to Lyman series

Answer :

A::B::D

Solution :

nn−12=6⇒n=4

if the initial state were n=3, in the emission spectrum, no wavelength shorter than λ0 would have occurred.

This is possible if initial state weren=2.