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Jun 14 2010   3:48PM GMT

Is that a principle or a principal?

Ivy Wigmore Ivy Wigmore Profile: Ivy Wigmore

Which is correct?
Wave-particle duality is a fundamental __________ of quantum theory.
a. principle
b. principal

Answer: a.

A principle is a rule or a law. Principal refers to either financial capital or debt, or the foremost person in some capacity (such as a principal ballerina).

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