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MMLU-Pro / 9664 / A laser beam (694nm wavelength) is used in measuring variations in the size of…

Problem

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question

A laser beam (694nm wavelength) is used in measuring variations in the size of the moon by timing its return from mirror systems on the moon. If the beam is expanded to 1m diameter and collimated, estimate its size at the moon. (Moon's distance \sim 3.8 × 10^5 km.)

category

physics

options

  1. 1.5km
  2. 0.5km
  3. 0.9km
  4. 3.0km
  5. 2.5km
  6. 1.22km
  7. 0.8km
  8. 2.0km
  9. 0.643km
  10. 0.3km

src

stemez-Optics

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