Question

The brackett series of spectral lines arise when an electron in excited hydrogen atom jumps from an energy level:​

Answer 1

Answer:

21

Explanation:

Since, the first excited state is 2

nd

orbit. Similarly, the ninth excited state is 10

th

orbit.

For spectral lines in Brackett series in H-atom.

n

1

=4

Formula for number of possible spectral lines

=

2

(n

2

−n

1

)(n

2

−n

1

+1)

Here, n

2

=10 , n

1

=4

Maximum spectral lines =

2

(10−4)(10−4+1)

=

2

6∗7

=21