In the diffusion equation, what does the term (ν Σ_f φ)/k_eff represent?

• A. Represents external source S.
• B. Represents production of neutrons from fission per unit volume per unit time, given by (ν Σ_f φ)/k_eff.
• C. Represents leakage term.
• D. Represents absorption rate.

Answer: (B)