Question

Number of spectral lines in balmer series when an electron return from 7 th orbit to 1st orbit of hydrogen atom are.......( Plzzzzz show calculation)

Answer 1

(7-1)(7-1+1) /2
(6)(7) /2
42/2
21 this is total no of spectral line

spectral line for balmer series = (7-2) =5

Answer 2

Answer: The number of spectral lines in balmer series for the given transition are 5.

Explanation:

We are given:

An electron is undergoing a transition from n = 1 to n = 7.

• To calculate the total number of spectral lines in the transition, we use the formula:

$N=\frac{(n_2-n_1)(n_2-n_1+1)}{2}$

where,

$n_1$ = lower energy level = 1

$n_2$ = higher energy level = 7

Putting values in above equation, we get:

$N=\frac{(7-1)(7-1+1)}{2}=21$

So, the total number of spectral lines in the transition are 21.

• To calculate the number of spectral lines in a particular series, we use the formula:

$N=(n_2-n_1)$

where,

$n_1$ = lower energy level = 2 (for Balmer)

$n_2$ = higher energy level = 7

Putting values in above equation, we get:

$N=(7-2)=5$

Hence, the number of spectral lines in balmer series for the given transition are 5.