Question

In a sample of Hydrogen gas, the electron in atoms are present in 5th excited state. The maximum number of lines appeared when electron returned to ground state is


10


15


12


6

Answer 1

the ans is 6

here is ur explanation

pls mark this ans as brainliest ans❤

thank u☺

Answer 2

The maximum number of lines appeared when electron returned to ground state is b)15.

Given,

Transition of the electron from 5th excited state to the ground state.

To find,

the maximum number of spectral lines.

Solution.

• Spectral lines are produced by the transition of electrons from higher energy level to lower energy level and vice-versa, in an atom.
• As the electrons excite and de-excite, energy is emitted in the form of light which gives an element its characteristic colour.

Number of spectral lines when an electron makes a transition from an energy level to another energy level are calculated as:

$=\frac{(n2-n1)(n2-n1+1)}{2}$

where,

n2-higher energy level

n1-lower energy level.

Number of spectral lines when an electron makes a transition from higher energy level n to the ground state of an atom is calculated as:

$=\frac{n(n-1)}{2}$

Here,

5th excited state, n2=6

Ground state, n1=1.

Number of spectral lines when the electron makes transition from 5th excited state to the ground state are:

$=\frac{n(n-1)}{2}\\=\frac{6(6-1)}{2}\\=\frac{6X5}{2}\\=\frac{30}{2} \\=15.$

Hence, the number of spectral lines are 15.

#SPJ2