Question

The number of atoms per unit volume that undergo absorption transition per
second is called........​

Answer 1

Answer:

Stimulated emmision....

Answer 2

Answer:

Rate of absorption transition

Explanation:

• In absorption transition, atoms from the ground state absorb energy from the external source, gets excited to the higher state.
• If certain number of atoms per unit volume undergo absorption transition in unit time, then it is called rate of absorption transition.                                                                                                                                  $\\ R_{absoption}= \frac{dN_{1} }{dt}$
• Rate of absorption transition depends on the number of atoms available in the ground state.