Refraction. refraction is always accompanied by a wavelength and speed change
A light-year is a <u>distance</u>.
It's the distance that light travels through vacuum in one year.
The distance is 9.4607 x 10¹² kilometers in metric units, and 5.8786 x 10¹² miles
in 'customary' units, and is normally written without a bunch of question marks.
Answer:
speed of running
speed of working
speed of learning
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Explanation: