Question

Which of the following is the correct expression for the relation between Einstein’s coefficients A and B?

(a) \(\frac{8\pi v^3 h}{c^3}\)

(b) \(\frac{8\pi v^2 h}{c^3}\)

(c) \(\frac{8\pi v^2 h}{c^2}\)

(d) \(\frac{8\pi hv}{c^3}\)

The question was posed to me in a national level competition.

I'd like to ask this question from Einstein Coefficients in portion Laser of Engineering Physics II

Answer 1

The correct answer is (a) \(\frac{8\pi v^3 h}{c^3}\)

Explanation: The expression \(\frac{8\pi v^3 h}{c^3}\) is the correct expression for the relation between the two Einstein’s coefficients. This expression is known as the Einstein’s relation.