What did the Stern-Gerlach experiment demonstrate?
Quantum spin
Relativity
Wave-particle duality
Photoelectric effect
Answer
Quantum spin was demonstrated by the Stern-Gerlach experiment. This experiment involved passing a beam of silver atoms through a magnetic field gradient. The atoms were deflected in either the upward or downward direction, corresponding to their spin being either up or down. This result showed that electrons have an intrinsic angular momentum, or spin, which is a fundamental property of subatomic particles.
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