How are the particles in the elementary particle zoo classified in order to relate them effectively?
a. By particle size.
b. By charge.
c. By which force the particles participate in.
d. By mass.
e. By location.
c
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How is it that we can "feel" radiation from the Sun that we cannot see?
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Photos A and B both show the same field of view containing a star-forming molecular cloud. One of the photos was taken in visible light and the other in infrared light. Which one is the visible-light photo, and how do you know?
A) Photo A is the visible-light photo, and we can tell because dust in the molecular cloud absorbs visible light, making the cloud appear dark. B) Photo A is the visible-light photo because its stars are more colorful. C) Photo B is the visible-light photo because more stars are visible in the molecular cloud. D) Photo B is the visible-light photo because the molecular cloud has a reddish tint.
The proper order of the layers of a generic atmosphere from lowest altitude to highest is
A) troposphere, stratosphere, exosphere, thermosphere. B) troposphere, stratosphere, thermosphere, exosphere. C) stratosphere, troposphere, exosphere, thermosphere. D) stratosphere, troposphere, thermosphere, exosphere. E) none of the above
Explain how rotation and magnetic fields influence the formation of the protostar
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