A positron and its antiparticle, the electron, can annihilate each other and produce
A. high-energy photons.
B. green electrons and anti-green electrons.
C. protons and antiprotons.
D. quarks and antiquarks.
Answer: A
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The rotation of the Sun's photosphere is
a. fastest at the equator, slower at mid-latitudes, and slowest near the poles. b. slowest at the equator, faster at mid-latitudes, and fastest near the poles. c. fastest at the equator, slowest at mid-latitudes and the poles which travel at the same speed . d. the same regardless of latitude.
Astronomers determine the internal structure of a star by using stellar models, since they cannot "see" into the interior of a star
a. True b. False Indicate whether the statement is true or false
When you see the bright flash of a meteor, what are you actually seeing?
A) a star that has suddenly shot across the sky B) a bright star moving quickly past our solar system C) emission of visible light from a particle that has not yet entered Earth's atmosphere D) the flash that occurs when a speeding rock from space hits the ground E) the glow from a pea-size particle and the surrounding air as the particle burns up in our atmosphere
The force of the floor pushing up on you to counter your weight is an example of a ________ force.
Fill in the blank(s) with the appropriate word(s).