What are electrons and holes ?

What are electrons and holes ?
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Answer :

Electrons are negatively charged particles and holes are positively charged. An electron does not bind to any covalent bond in a pure semiconductor when a quintile element is mixed . These electrons easily act as negative charge carriers. Adding a triangular element to a pure semiconductor again creates a demand for an electron i.e. a hole which acts as a positive charge carrier.
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Electric current in a metal wire is due to the flow of — (1) Electrons (2) Protons (3) Ions (4) Holes

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(2) experience collision less frequently Explanation: When an electric field is applied, both the valence electrons and the free electrons move in the same direction. The hole direction is opposite to that of valence electron but the mobility is the same. Even for the same electric field, valence electrons cannot move as freely as the free electrons because its movement is restricted due to collisions. Therefore, the velocity of valence electrons is less compared to free electrons. In other words, the velocity of holes is less compared to free electrons. This means mobility is also less for a hole compared to free electron.

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Last Answer : (a) Minority carrier

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Last Answer : (A) holes.

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Last Answer :  experience collision less frequently

The region consisting of holes and electrons near the p-n junction of a diode is

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Description : In heating frozen foods in sealed pouches in microwaves, why do you first poke holes in the pouch? (1) To prevent the steam pres-sure from bursting open the pouch (2) To allow the heat to get into ... into the food through the holes (4) To allow the aroma of the food to come out through the holes

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Last Answer : ANSWER: Z -- SLIGHTLY LIGHTER THAN URANIUM-238.

In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch? (1) To prevent the steam pressure from bursting open the pouch (2) To allow the heat to get into the food through the hole (3) To allow the microwaves to get into the food through the holes (4) To allow the aroma of the food to come out through the holes

Description : In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch? (1) To prevent the steam pressure from bursting open the pouch (2) To allow the heat to get into ... into the food through the holes (4) To allow the aroma of the food to come out through the holes

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Metals are good conductors of electricity because - (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above

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Description : If a billion electrons enter a point in 1 s, then number of electrons leaving that point in 1 s are A. 2 billion B. 3 billion C. 1 billion D. 10 billion

Last Answer : 1 billion

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Last Answer : equal electrons and protons

Particles involved in the movement within material are A. protons B. electrons C. neutrons D. positrons

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