GRE Subject Test: Physics : Fundamental Concepts

Study concepts, example questions & explanations for GRE Subject Test: Physics

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All GRE Subject Test: Physics Resources

33 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #1 : Quantum Mechanics And Atomic Physics

Which of the following wavelengths could be used to measure the position of an electron with the greatest accuracy?

Possible Answers:

Gamma-rays

Red light

X-ray

Radio

Infared

Correct answer:

Gamma-rays

Explanation:

The Heisenberg Uncertainty principle states that

Therefore, the smallest wavelength will have the lowest uncertainty in the position. Thus, we must pick the regime of options given which has the lowest wavelength. That is gamma-ray. 

Example Question #2 : Quantum Mechanics And Atomic Physics

What wavelength will result in the most accurate measurement of the momentum of an electron?

Possible Answers:

Gamma-ray

Radio

X-ray

Infrared

Red light

Correct answer:

Radio

Explanation:

The Heisenberg Uncertainty Principle states that:

 Since the uncertainty in the position is inversely proportional to the uncertainty in the momentum, we need to pick the longest wavelength. Of the options listed, radio has the longest wavelength.  

All GRE Subject Test: Physics Resources

33 Practice Tests Question of the Day Flashcards Learn by Concept
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