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  1. Subjects ›
  2. GRE Subject Test Physics ›
  3. Question of the Day

GRE Subject Test Physics Question of the Day

GRE Subject Test Physics Question of the Day

Answer today's GRE Subject Test Physics question, reveal the full explanation, then keep the streak going with a new question every day.

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

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Question of the Day

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

  1. Radio (correct answer)
  2. Red light
  3. X-ray
  4. Gamma-ray
  5. Infrared

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.