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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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
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).
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.
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