Question

In a given sample of hydrogen gas when radiation is passed, then electrons are excited to 6th orbit and returned to the ground state. Then the number of spectral lines formed in IR region is​

Answer 1

Paschen series lies in the IR region.

n for paschen series is 3

n₁ = 6, n₂ = 3

no of spectral lines:

$\frac{(n_1- n_2)(n_1- n_2 + 1 )}{2}$

$\frac{ 3 * 4}{2}$

= 6 lines belong to IR region.

Answer 2

The number of spectral lines formed in the IR region is​ 3.

Given: In a given sample of hydrogen gas when radiation is passed, then electrons are excited to the 6th orbit and returned to the ground state.

To Find: The number of spectral lines formed in the IR region is​

Solution:

According to the Paschen series, a sequence of absorption or emission lines in the near-infrared part of the spectrum is due to hydrogen.

These emission lines in the infrared part of the spectrum are caused by electron jumps that occur between the third energy level and higher levels of electrons.

Now, the wavelengths of the Paschen series for hydrogen where these emissions occur in the electrons are given by the formula,

1/λ=RH(1/32−1/n2) 1 / λ = R H ( 1 / 3 2 − 1 / n 2 )

Paschen series lies in the IR region.

n for paschen series is 3

n₁ = 6

n₂ = 3 no of spectral lines

Therefore, the number of spectral lines formed in the IR region is​ 3.

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