Question

The equation corresponding to wave number of spectral lines in pfund series is​

Answer 1

Answer:

Explanation:

R[1/5^2-1/6^2]

Answer 2

Answer:

The equation corresponding to wave number of spectral lines in Pfund series is  ${\bar_{\nu}} = R\big_{[\frac{1}{5^{2}} -\frac{1}{n_{2}^{2}} ]}$   where n₂ = 6, 7, 8....

Explanation:

Plank's quantum theory have given the atomic spectra of hydrogen and hydrogen like particles.

The spectra of hydrogen whose wave number of spectral lines is given by:-

${\bar_{\nu}} =\frac{\nu}{c} =\frac{1}{\lambda} = R\big_{[\frac{1}{n_{1}^{2}} -\frac{1}{n_{2}^{2}} ]}$

where R is the Rydberg's constant.

The spectra of hydrogen consists five series:

• Lyman series: n₁ = 1 and n₂ = 2, 3, 4,..........
• Balmer series: n₁ = 2 and n₂ = 3, 4, 5,.........
• Paschen series: n₁ = 3 and n₂ = 4, 5, 6,.........
• Brackett series: n₁ = 4 and n₂ = 5, 6, 7,...........
• Pfund series:  n₁ = 5 and n₂ = 6, 7, 8,.............

Equation of wave number for the spectral lines of Pfund series:

 ${\bar_{\nu}} =\frac{1}{\lambda} = R\big_{[\frac{1}{5^{2}} -\frac{1}{n_{2}^{2}} ]}$

where n₂ = 6, 7, 8,.............

Pfund series is observed in infrared region in electromagnetic spectrum.