Electrons are emitted from a conductor when the conductor is
a. exposed to weak light.
b. bombarded by high-speed electrons.
c. cooled rapidly.
d. subjected to a small voltage.

Electrons, the negatively charged particles that carry electricity in metals, can be ejected from the material if it is bombarded by a large number of high-speed electrons. This effectively, leads to some metallic electrons being "knocked" out of the material.

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