Which of the following are quanta?
A) photons
B) electrons
C) Both of the above.
D) neutrinos
E) All of the above.
Question 2
Is there a force on the moon, and how do you know?
A) No, because the moon moves at an unchanging speed.
B) No, because the moon is not accelerated.
C) Yes, because there must be a force to keep the moon moving.
D) Yes, because the moon is accelerated.
E) Yes, because there must be a force pulling outward on the moon, away from Earth, to keep the moon from falling down to Earth.
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