Question

An n type semiconductor is illuminated by a steady flux of photons with energy greater than the band gap energy. The change in conductivity Δσ obeys which relation?
[ Here, e is the electron charge, μn electron mobility, μp hole mobility, Δn (Δp) is the excess electron (hole) density ].

a.

Δσ = 0

b.

Δσ = e(σn + σp) Δn

c.

Δσ = e(μnΔn - μpΔp)

d.

Δσ = e μnΔn

Answer: (b).Δσ = e(σn + σp) Δn

Interact with the Community - Share Your Thoughts

Uncertain About the Answer? Seek Clarification Here.

Understand the Explanation? Include it Here.

Q. An n type semiconductor is illuminated by a steady flux of photons with energy greater than the band gap energy. The change in conductivity Δσ obeys which relation? [ Here, e is...

Similar Questions

Explore Relevant Multiple Choice Questions (MCQs)

Q. The band gap of Si at room temperature is

Q. Spot the odd one out

Q. Transition capacitance is associated with __________ and depletion capacitance is associated with __________ diodes.

Q. If the energy gap of a semiconductor is 1.1 eV, then it would be.

Q. The maximum rectification efficiency in case of full wave rectifier is

Q. For a full wave bridge rectifier supplied with 50 Hz a.c., the lowest ripple frequency will be

Q. When an electron rises through a potential of 100 V it will acquired an energy of

Q. Which one of the following gain equations is correct for a MOSFET common-source amplifier?

(gm is mutual conductance, and RD is load resistance at the drain)

Q. If 1 kVA transformer is used for all of the following rectifiers, the d.c. power availability will be least in case of

Q. In which of the following does a negative resistance region exist in the v-i characteristics?

Q. The intrinsic resistivity of silicon at 300 K is about

Q. What happens when forward bias is applied to a junction diode?

Q. A differential amplifier is invariably used in the I/P stage of all OP-amps. This is done basically to produce the OP-amp with a very high.

Q. The addition of impurity in extrinsic semiconductor is about 1 part in 10⁸ parts.

Q. It is required to trace the output characteristics of a CE bipolar transistor on a CRO screen. The proper method is

Q. Atomic number of germanium is

Q. The resistivity of ferrites is

Q. A JFET

Q. In monostable multivibrator

Q. Which of the following is the ferric electric material?

Recommended Subjects

Are you eager to expand your knowledge beyond Electronics and Communication Engineering? We've handpicked a range of related categories that you might find intriguing.

Click on the categories below to discover a wealth of MCQs and enrich your understanding of various subjects. Happy exploring!