Light quiz
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What is a single particle of light called?
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More questions about Light
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Why does a straw look bent in a glass of water?
Answer: Refraction
Why: The same bending makes a pool look only about three-quarters as deep as it really is when you look down into it.
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What bends starlight that passes close to the Sun?
Answer: Gravity
Why: Einstein's theory predicted twice the bending that Newton's gravity gives, and the 1919 eclipse measurements backed Einstein.
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What makes the water in some nuclear reactors glow blue?
Answer: Cherenkov radiation
Why: Light moves through water at only about three-quarters of its vacuum speed, and particles outrunning it set off a kind of sonic boom of light.
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Why do stars twinkle?
Answer: Moving air
Why: Planets usually shine steadily because they look like tiny disks, not points, so the air's wobbles average out.
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Which color do the hottest stars glow?
Answer: Blue
Why: The hottest blue stars top 33,000 kelvin at the surface, more than ten times hotter than the coolest red stars.
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How does a beam of one color change as it gets brighter?
Answer: More photons
Why: Photon energy depends only on color, so a bright red lamp frees no electrons from potassium, while dim blue light does.
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