Isaac Newton quiz
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How many colours did Newton settle on for the rainbow?
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More questions about Isaac Newton
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What did Newton explain using the pull of the Moon and Sun?
Answer: Tides
Why: Two ocean bulges, one facing the Moon and one on Earth's far side, explain the two daily high tides in his model.
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Which occult art filled about a million words of Newton's papers?
Answer: Alchemy
Why: Much of it is Newton copying out other alchemists' manuscripts and adding his own notes.
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Which planet's orbit defied Newton's gravity until Einstein?
Answer: Mercury
Why: The mismatch is tiny, about 43 arcseconds per century in where Mercury's orbit swings closest to the Sun.
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How many laws of motion did Newton set out?
Answer: Three
Why: Descartes had already published the core of the first law: a body once moving keeps moving, in a straight line.
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What is the earliest year Newton allowed for the world's end?
Answer: 2060
Why: Rather than a forecast, the 2060 date was a floor meant to curb rash doomsday predictions.
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What speed did Newton calculate about 15% too low?
Answer: Speed of sound
Why: Newton assumed air stays at one temperature, but sound waves warm and cool it as they squeeze it, and allowing for that closes the gap.
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