What are the primary components of all rock
forming minerals?
a) oxygen and nitrogen
b) hydrogen and helium
c) oxygen and silicon
d) iron and nickel
c
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Spectroscopic parallax denotes the apparent shift in the position of a star when observed form different positions of a source
Indicate whether the statement is true or false
Double-lobed radio galaxies appear to be emitting jets of gas and radiation
Indicate whether the statement is true or false
When you see the bright flash of a meteor, what are you actually seeing?
A) the glow of heated air surrounding a small particle as it burns up in our atmosphere B) emission of visible light from a particle that has not yet entered Earth's atmosphere C) a star that has suddenly shot across the sky D) the flash that occurs when a speeding rock from space hits the ground
Which of these is a refinement that Niels Bohr made to the Rutherford model of the atom?
A. Electrons orbit about a dense positively charged nucleus. B. Atoms consist of negatively charged electrons and positively charged protons. C. An electron's angular momentum is quantized, but not in integral multiples of ?. D. Electrons can exist only in certain circular orbits about the nucleus.