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Physics-

General

Easy

Question

The impurity atom added to germanium to make it N-type semiconductor is

Arsenic
Iridium
Aluminium
Iodine

The correct answer is: Arsenic

For N-type semiconductor, the impurity should be pentavalent.

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A piece of copper and the other of germanium are cooled from the room temperature to 80 K, then which of the following would be a correct statement

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Consider an initially pure M gm sample of ^AX, an isotope that has a half life of T hour, what is it’s initial decay rate (N_A= Avogrado No.)

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$text If end text c o s invisible function application 25 to the power of ring operator end exponent plus s i n invisible function application 25 to the power of ring operator end exponent equals$ K_t then cos $20 to the power of ring operator end exponent$ equal to

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If cot $theta equals fraction numerator square root of m plus square root of n over denominator square root of m minus square root of n end root end fraction$ ,then $left parenthesis m plus n right parenthesis$ cos $2 theta$ is equal to

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