MEDIUM
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IMPORTANT
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Assertion: The resistivity of a semiconductor increases with temperature.

Reason: In a conducting solid, the rate of collisions between free electrons and ions increases with increase of temperature. 

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Important Questions on Semiconductors

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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 11
Two wires of aluminium and germanium are cooled to a temperature of 770 K. Then,
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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 12
Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to  EgC, EgSi  and EgGe. Which of the following statements is true?
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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 13
The safety limit of temperatures for Ge  and Si  are-
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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 14
At 0 K temperature, a p- type semiconductor 
 
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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 15
In a semiconductor, separation between conduction and valence band is of the order of
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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 16
The forbidden gap in the energy bands of germanium at room temperature is about 
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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 17
The fermi energy for a substance is (T is the temperature)-
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Physics Crash Course MHT-CET>Chapter 24 - Semiconductors>Exercise 1>Q 18
The electrical conductivity of a semiconductor increases when electromagnetic radiation of a wavelength shorter than 2480 nm is incident on it. Find the band gap of the semiconductor. [Given h=6.63×10-34J s, c=3×108 m s-1]