Question

How many spectral lines are formed when electron jumps
from 7th level to 1st level in hydrogen atom?

Answer 1

Answer:

Given

A hydrogen atom, Having n

2

=5 and n

1

=1

Total no of the spectral lines =

2

(n

2

−n

1

)(n

2

−n

1

−1)

Here n

2

=5 and n

1

=1

Therefore the total no of the spectral line

2

(5−1)(5−1−1)

=

2

20

=10

So, the ten lines is

5→4,5→3,5→2,5→1,4→3,4→2,4→1,3→2,3→1,2→1 are

possible in this case.

Of all this lines only, one's falling in Balmer series are in visible region.

For Balmer series,x=2 and y=3,4,5

Thus,

5→2,4→2,3→2 it shows three lines lie in the visible region.

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