A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 29

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Earn 100

In semiconductors at room temperature

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Important Questions on Electronic Devices

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IMPORTANT

A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 30

The depletion layer of a

p - n

junction

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 31

If the ratio of the concentration of electrons to that of holes in a semiconductor is

\frac{7}{5}

and the ratio of currents is

\frac{7}{4}

, then what is the ratio of their drift velocity?

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 32

Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by

{(E_{g})}_{C^{'}} {(E_{g})}_{S i}

and

{(E_{g})}_{Ge}

respectively. Which one of the following relationships is true in their cases ?

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 33

In the middle of the depletion layer of reverse biased $p - n$ junction, the

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 34

The $n -$ type semiconductors are obtained, when germanium is doped with

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 35

When

p

-

n

diode is forward biased then

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 36

Which of the following statements is true for an

n -

type semiconductor ?

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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 37

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the,