Answered

Electrons are emitted from a conductor when the conductor is

Abombarded by high-speed electrons.
Bcooled rapidly.
Csubjected to a small voltage.
Dexposed to weak light.

Verified Answer :

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Abombarded by high-speed electrons.
Electrons are emitted from a conductor when the conductor is bombarded by high-speed electrons. This is because the electrons that are already present in the object especially when the object receiver is a metal, water or any object able to conduce electricity, the electrons in these objects are in form of potential energy and when other electrons are in contact with them they move and thus being from potential to kinetic.

Answer:

A. bombarded by high-speed electrons.

Explanation:

Conductors are materials that allows current to pass through them.

However, the flow of current is actually the flow of electrons in the opposite direction.

When a conductor is bombarded by by high-speed electrons, the high speed electrons will repel the electrons in the conductor (in electromagnetism, like charges repel) thus giving them the required kinetic energy to leave the surface of the conductor.