Examlex
How fast should you move away from a 6.0 *1014 Hz light source to observe waves with a frequency of 4.0 * 1014 Hz?
Exam
A formal test of a person's knowledge or proficiency in a particular subject or skill.
Shortened Eyeball
An eyeball that is shorter than normal, often associated with hyperopia or farsightedness.
Light Rays
Streams of photons, which are elementary particles of light, that travel in straight lines and are visible when they encounter an object or substance.
Magnifying Lens
An optical lens or device designed to enlarge the appearance of objects viewed through it.
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