Name: Bohr Atom Model: Frequency of Emitted Radiation
Uploaded: 2019-07-19
Duration: 3 min 54 s
Description: Electrons jump in different energy levels. Let's understand how we can calculate the frequency of emitted and absorbed radiation as electrons transition into...

Question

Name different series of lines observed in hydrogen spectrum.

Accepted Answer

Lyman Series: When the electron jumps from any higher stationary orbit to first stationary orbit, the spectral lines fall in the Lyman series.

For Lyman series, $n_{i} = 1$

Now putting $n_{f} = 1$ in the relation given by Bohr, $w = R_{h} (\frac{1}{1^{2}} - \frac{1}{n_{i}^{2}}), n_{i} = 2, 3, 4 . . . .$

Balmer Series: When the electron jumps from any higher stationary orbit to the second stationary orbit with $n_{f} = 2$ , the spectral lines fall in the Balmer Series. Here, $n_{i} = 2$

$w = R_{h} (\frac{1}{2^{2}} - \frac{1}{n_{i}^{2}}), n_{i} = 3, 4, 5 . . . .$

Paschen Series: When the electron jumps from any higher stationary orbit to fourth stationary orbit with $n = 3$ , the spectral lines fall in Paschen Series. Here, $n_{f} = 3$

$w = R_{h} (\frac{1}{3^{2}} - \frac{1}{n_{i}^{2}}), n_{i} = 4, 5, 6 . . . .$

Brackett Series: When the electron jumps from any higher stationary orbit to fourth stationary orbit with $n = 4$ , the spectral lines fall in Bracket Series. Here, $n_{f} = 4$

$w = R_{h} (\frac{1}{4^{2}} - \frac{1}{n_{i}^{2}}), n_{i} = 5, 6, 7 . . . .$

Pfund Series: When the electron jumps from any higher stationary orbit to fourth stationary orbit with $n = 5$ , the spectral lines fall in Pfund Series. Here, $n_{f} = 5$

$w = R_{h} (\frac{1}{5^{2}} - \frac{1}{n_{i}^{2}}), n_{i} = 6, 7, 8 . . . .$

Hence, it is the required answer.

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