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What is the refractive index of vacuum? (40 points)

	undefined
	0
	10
	1
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written by sam • topics: science block unblock • physics block unblock • light block unblock • speed block unblock • general block unblock

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What describes how ceiling star stickers glow in the dark? (30 points)

	bioluminescence
	phosphorescence
	fluorescence
	chemiluminescence
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written by sam • topics: science block unblock • pop culture block unblock • physics block unblock • physical chemistry block unblock • quantum mechanics block unblock and 3 more » • light • spectroscopy • nature

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What color is at the top of the arc in a double (or secondary) rainbow? (40 points)

	green
	violet
	red
	white
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written by darko • topics: science block unblock • weather block unblock • light block unblock • physics block unblock

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Thomas Edison invented the incandescent light. Who made the first fluorescent light? (30 points)

	Willis Whitnew
	Johann Geissler
	Thomas Edison
	William David Coolidge
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written by SteveD503 • topics: science block unblock • Technology block unblock • light block unblock • history of science block unblock • Thomas Edison block unblock and 2 more » • inventors • Inventions

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It takes about 500 seconds for light to reach Earth from the sun, but how long to go from the center of the Sun to the surface? (40 points)

	about 5 minutes
	about a million years
	about a day
	about 4 seconds
	about .3 nanoseconds
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written by Aarmed • topics: sun block unblock • cosmology block unblock • light block unblock • ray block unblock • science block unblock

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Which colour of light is the eye most sensitive to? (40 points)

	Green
	Red
	All equal
	Blue
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written by Baggins • topics: science block unblock • Biology block unblock • light block unblock • human body block unblock • colors block unblock

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