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15
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What scientific idea is Doppler known for?
The Doppler effect
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15
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What does the Doppler effect help astronomers measure?
Whether stars and galaxies are moving toward or away from us
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baam
Lose 10 points!
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magnet
Take 20 points!
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shark
Other team loses 25 points!
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thief
Give points!
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25
15
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What is Eratosthenes famous for measuring?
Earth’s circumference
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15
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What everyday example demonstrates the Doppler effect?
An ambulance siren changing pitch as it passes
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15
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How did Priestley discover oxygen?
By heating mercury oxide with sunlight
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What did Priestley use to test his gas samples?
Candles and animals (like mice)
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15
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How did Eratosthenes measure Earth’s size?
By comparing shadows at two locations
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15
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What happens to light from stars moving away from Earth?
It becomes red-shifted
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What effect did Priestley notice when mice breathed oxygen?
They lived longer and were more active
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What assumption did Eratosthenes make about the Sun’s rays?
That they arrive at Earth parallel to each other
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lifesaver
Give 15 points!
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star
Double points!
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gift
Win 10 points!
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banana
Go to last place!
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15
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What happens to sound waves when something moves toward you?
The waves compress and frequency increases
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15
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Which country did Eratosthenes live in?
Ancient Greece (in Egypt at the Library of Alexandria)
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boom
Lose 50 points!
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seesaw
Swap points!
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shark
Other team loses 25 points!
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banana
Go to last place!
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15
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What tool did Eratosthenes mainly use to make his calculations?
A gnomon or stick for measuring shadows
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