Question

if n1 and n2 are the number of atoms in ground state and excited state,rate of absorption is given by

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Rate of absorption is given by B₁₂n₁E.

Explanation:

Einstein Coefficient Relation

• Einstein showed three major processes spontaneous emission, stimulated absorption, and stimulated emission which shows interaction between radiation and the matter.
• Out of the above three processes the stimulated emission is the important and essential process.

Using the Einstein coefficients we will derive the rate of absorption.

We know, the absorption takes places when the atoms or electrons are excited from ground state to the excited state.

Number of atoms in ground state is n₁ and number of atoms in excited state is n₂.

Rate of absorption is directly proportional to the number of atoms n₁ per unit volume in the ground state and the energy density of radiation i.e. E.

⇒ Rate of absorption ∝ n₁E

⇒ Rate of absorption = B₁₂n₁E

(B₁₂ = Einstein’s coefficient of stimulated absorption)

Therefore, the rate of absorption is B₁₂n₁E.