SAT Subject Physics Practice Question 154: Answer and Explanation

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Question: 154

17. The impossibility of making simultaneous, arbitrarily precise measurements of the momentum and the position of an electron is accounted for in

A. thermodynamics
B. quantum mechanics
C. classical electrodynamics
D. special relativity
E. general relativity

Correct Answer: B


Making simultaneous measurements of position and momentum is limited by the Uncertainty Principle, a quantum mechanical law.

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