# If the electron in the hydrogen atoms is excited to n = 5 state, the number of frequencies present in the radiation emitted is: Option 1) 4 Option 2) 5 Option 3) 8 Option 4) 10

Orbital Frequency of electron -

$f= \frac{mz^{2}e^{4}}{4\epsilon_{0}^{2}n^{3}h^{3}}$

- wherein

$f\alpha \frac{Z^{2}}{h^{3}}$

Number of frequency emitted from nth orbital is

$\frac{n(n-1))}{2}$

$\because n=5$

=> number of frequency emitted  =$\frac{5\times 4}{2}$

=10

Option 1)

4

Option is incorrect

Option 2)

5

Option is incorrect

Option 3)

8

Option is incorrect

Option 4)

10

Option is correct

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