Q. When light of suitable frequency falls on certain metal surfaces, electrons are emitted from it. This phenomenon is known as __.

A
Meissner effect
B
Zeeman effect
C
Total internal reflection
D
Photoelectric effect
Solution:

The photoelectric effect was discovered by the German physicist Heinrich Rudolf Hertz.
The Meissner effect is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state.

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