What happens to photons as they travel through the atmosphere after being emitted by the Atlas instrument?
ICESat-2 By the Numbers: 300 Trillion

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Physics, Science
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5th - 12th Grade
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
They increase in number.
They disappear completely.
They are absorbed by the atmosphere.
They scatter in all directions.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many photons does the Atlas instrument typically receive back?
Thousands of photons
None
Hundreds of photons
Just about a dozen photons
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of the Atlas instrument in photon reflection?
It captures only photons that reflect straight back.
It increases the number of photons.
It captures photons that reflect in all directions.
It absorbs all photons.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important for the window of received photons to be very small?
To increase the number of photons received
To reduce the timing error
To capture photons from different directions
To make the instrument more powerful
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What allows scientists to calculate elevation very precisely?
The large number of photons received
The small window of received photons
The speed of the photons
The high power of the Atlas instrument
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