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12th West Bengal Board
IMPORTANT
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In a semiconductor the forbidden energy gap in between valence band conduction band is about

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Important Questions on Electronic Devices

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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 6
The forbidden energy gap in Ge and Si respectively are
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 7

The impurity atoms that should be added to germanium to make it n-type is

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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 8
The impurity atoms to be doped in germanium to make it p-type is
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 9
The main difference between conductor, semiconductor and insulator is
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 10
The temperature coefficient of resistance of a semiconductor
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 11
In p-type semiconductors, current conduction is due to
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12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 12

If nh and ne be the number density of holes and free electrons respectively, then

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12th West Bengal Board
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A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 13

Copper and silicon are cooled from 300 K to 60 K, the specific resistance