When a particle and antiparticle meet, they are said to annihilate each other. What does this mean?
a. They explode into tiny fragments.
b. They are destroyed, and turned into an equivalent amount of energy.
c. They merge and simply disappear.
d. none of the above
B
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The ______________electrons of an atom are the electrons in an incomplete electron shell that are outside of a spherically symmetric closed electron shell corresponding to an inert-gas atom.
Fill in the blank(s) with the appropriate word(s).
Reflection, refraction, and the formation of images by mirrors and lenses has been successful described by the
A) wave model of light. B) ray model of light. C) particle model of light. D) electro model of light. E) none of the given answers
The discovery of Charon allowed astronomers to determine Pluto's mass
Indicate whether the statement is true or false
Which of these is NOT true about the early Arab practice of alchemy?
a. Alchemists were looking for the secrets of eternal life and how to turn inexpensive materials into gold. b. Alchemists were early experimental scientists and observers. c. Alchemy was pseudoscience, rather than involving any form of research. d. Alchemists were important predecessors of modern chemists. e. Alchemists studied materials and how they changed.