Question

The necessary condition for absorption spectrum is that  __________

(a) hν should be greater than the energy difference

(b) hν should be smaller than the energy difference

(c) hν should be equal to the energy difference

(d) none of the mentioned

This question was addressed to me during an interview.

The question is from Origin of spectrum in chapter Absorption Spectroscopy of Engineering Chemistry I

Answer 1

Right answer is (c) hν should be equal to the energy difference

For explanation I would say: The necessary condition for absorption spectrum is that hν should be equal to the energy difference(ΔE = Ee – Eg).