Question
In hydrogen atom, there is single electron only but many lines in its emission spectrum. How it does? Explain the reason.
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Answer
Each atom have some definite energy levels. In normal state electron of hydrogen atom remains in low energy level. When atom gets energy from outside, electron jumps into higher energy level and leave the minimum energy level i.e. it becomes excited. Electron leave the higher energy level within $10^{-8} sec$. Now it can return in lowest energy level or can be return passing through the lower energy level to lowest one. Since, any light source (hydrogen lamp) has large numbers. of atoms therefore all possible transition initiates in source and many lines has seen in spectrum.
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