Light year is a measure of:
Correct answer: A. Distance
- A. Distance
- B. Time
- C. Intensity of light
- D. Velocity
Explanation
A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles or 9.7 trillion kilometres. As opposed to what the name implies, a light-year is a measurement of distance and not time.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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