GRE Subject Test: Physics : Quantum Mechanics
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Example Questions
Example Question #1 : Fundamental Concepts
Which of the following wavelengths could be used to measure the position of an electron with the greatest accuracy?
Radio
Red light
Gamma-rays
Infared
X-ray
Gamma-rays
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?
Gamma-ray
X-ray
Red light
Radio
Infrared
Radio
The Heisenberg Uncertainty Principle states that:
Example Question #3 : Quantum Mechanics And Atomic Physics
If a ground state particle is in a one-dimension square well, where is the probability of finding the particle equal to zero?
At the boundary.
None of these
In the middle.
At the boundary.
This is a fundamental concept question. For a ground state particle, the only place where the probability is equal to zero is at the boundary because the particle cannot be found there. He has to be in the box (not unlike a cat).
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All GRE Subject Test: Physics Resources
