An excited atom can lose energy by emitting a __________
Fill in the blank(s) with correct word
photon
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It is the day of the Summer Solstice. You notice that for you the Sun never sets. Who are you?
a) a macaw in the South American rain forest b) a penguin below the antarctic circle c) a polar bear above the arctic circle
The first person to suggest that the Earth moved around the Sun was
A) Aristarchus B) Newton C) Copernicus D) Galileo
In this photo, a fire extinguisher provides the impulse for a hallway rocket cart. Which is NOT true about the motion of the rocket cart and person?
a. The momentum of the cart and person is equal in magnitude and opposite in direction to the momentum of the expelled gas. b. The cart and person are propelled as a result of gas from the fire extinguisher pushing against air in the room. c. The force of the gas on the cart and person is equal and opposite to the force of the person and cart on the expelled gas.
Theory predicts that protostars are nonluminous objects
Indicate whether the statement is true or false