First slide

Hydrogen spectrum

Question

Hydrogen atoms are excited from ground state to the state of principal quantum number 4. Then, the number of spectral lines observed will be

Moderate

A

3
B

6
C

5
D

2

Solution

Possible transitions are: $4 \to 3, 4 \to 2, 4 \to 1, 3 \to 2, 3 \to 1 a n d 2 \to 1$
So, six transitions are possible.

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