When the universe was several hundred thousand years old, matter and energy decoupled, allowing the ________ radiation to escape, expand and cool off
Fill in the blank(s) with correct word
cosmic microwave background
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What conclusion can we draw about the motion of a star that does not show any Doppler shift in its spectrum?
A. The star does not have a magnetic field. B. The star may be moving perpendicular to our line of sight. C. The star is spinning fast. D. The star is not moving. E. We cannot draw any conclusions about the motion of this star.
The process of transforming sediment into sedimentary rock is called
a. lithification. b. striation. c. metamorphism. d. hardening.
Most of the world's sand is composed of the minerals
A) feldspar and quartz. B) silicon and oxygen. C) quartz and muscovite. D) silicon and aluminum.
Exclusion Principle: The only invalid electron state and shell designation among the following is
A. 1s, K (n = 1) shell. B. 2s, L (n = 2) shell. C. 2d, L (n = 2) shell. D. 3s, M (n = 3) shell. E. 3d, M (n = 3) shell.