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An atom has x energy level , then total ...

An atom has x energy level , then total number of lines in its spectrum are :

A

`1+2+3+....+(x+1)`

B

`1+2+3+....+x^(2)`

C

`1+2+3+...+x`

D

`1+2+3+...+(x-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
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