At what condition, the rate of electron capture from the conduction band and the rate of the electron emission back into the conduction band must be equal?

At what condition, the rate of electron capture from the conduction band and the rate of the electron emission back into the conduction band must be equal?

(a) Thermal equilibrium

(b) At room temperature

(c) T=250K

(d) At boiling temperature

The question was asked in a job interview.

The doubt is from Carrier Life time topic in section Conduction in Semiconductors of Electronic Devices & Circuits

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At what condition, the rate of electron capture from the conduction band and the rate of the electron emission back into the conduction band must be equal?

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