A simplified energy band-diagram of an intrinsic semiconductor at thermal equilibrium (300 K) is shown. In the accompanying table, which one of the four cloumns correctly represents the listed parameters? Assume same effective mass for electrons and holes. Parameter Energy-difference Column 1 Column 2 Column 3 Column 4 Band-gap ΔE2 ΔE1 ΔE2 ΔE1 Electron affinity E_12 ΔE2 - ΔE1 E_22 ΔE2 - ( E_12 ) Work function ΔE1 + ΔE2 ΔE2 - ( E_12 ) ΔE1 - E_22 ΔE2 + ( E_12 )

A simplified energy band-diagram of an intrinsic semiconductor at thermal equilibrium (300 K) is shown. In the accompanying table, which one of the four cloumns correctly represents the listed parameters? Assume same effective mass for electrons and holes.

Parameter	Energy-difference
	Column 1	Column 2	Column 3	Column 4
Band-gap	ΔE2	ΔE1	ΔE2	ΔE1
Electron affinity	$$\frac{\Delta E_1}{2}$$	ΔE2 - ΔE1	$$\frac{\Delta E_2}{2}$$	ΔE2 - $$\left(\frac{\Delta E_1}{2}\right)$$
Work function	ΔE1 + ΔE2	ΔE2 - $$\left(\frac{\Delta E_1}{2}\right)$$	ΔE1 - $$\frac{\Delta E_2}{2}$$	ΔE2 + $$\left(\frac{\Delta E_1}{2}\right)$$

Answer: Option B