The continuous part of an x-ray spectrum of an atom occurs because
a. of photon absorption.
b. of the photoelectric effect.
c. electrons in the atom make transitions to lower energy levels.
d. of the uncertainty principle.
e. of rapid deceleration of the bombarding electrons.
e
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Indicate whether the statement is true or false
How have astronomers interpreted the unexpectedly fast rotation of galaxies?
A.) Scientific measurements must be wrong. B.) Galaxies may be breaking up. C.) There must be a lot of dark matter whose gravity can be felt but not seen. D.) These galaxies must have had collisions. E.) B, C, and D.
Which of the following is not an igneous rock?
a. Andesite b. Granite c. Gneiss d. Basalt
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Fill in the blank(s) with the appropriate word(s).