Number of spectral lines in Balmer series when an electron return from 7 text th orbit to 1 text st orbit of hydrogen atom are

Question

Number of spectral lines in Balmer series when an electron return from 7 text th orbit to 1 text st orbit of hydrogen atom are (A) 5 (B) 6 (C) 21 (D) 15

Tardigrade Admin · Accepted Answer

As only visible lines have to be calculated i.e. Balmer lines

∴

Visible lines when ground state

= 2

n_{1} = 2

∴

Possible arrangements

7 \to 2, 6 \to 2, 5 \to 2, 4 \to 2, 3 \to 2

Total number of spectral lines

= 5

All have visible region because

n_{1} = 2

Q. Number of spectral lines in Balmer series when an electron return from 7th orbit to 1st orbit of hydrogen atom are

5

6

21

15

As only visible lines have to be calculated i.e. Balmer lines ∴ Visible lines when ground state =2 n1​=2 ∴ Possible arrangements 7→2,6→2,5→2,4→2,3→2 Total number of spectral lines =5 All have visible region because n1​=2

Q. Number of spectral lines in Balmer series when an electron return from $7^{th}$ orbit to $1^{st}$ orbit of hydrogen atom are

As only visible lines have to be calculated i.e. Balmer lines
$∴$ Visible lines when ground state $= 2$
$n_{1} = 2$
$∴$ Possible arrangements $7 \to 2, 6 \to 2, 5 \to 2, 4 \to 2, 3 \to 2$
Total number of spectral lines $= 5$
All have visible region because $n_{1} = 2$