Electrons in atoms
a. orbit the nucleus in well defined circular orbits
b. radiate electromagnetic energy continuously
c. act as if spread out in a "cloud" around the nucleus
d. behave as predicted by quantum mechanics
C, D
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The age of the solar system is believed to be approximately 4.6 billion years based on the data from
a. samples of lunar rocks. b. samples of Earth rocks. c. samples of meteorites. d. samples of lunar rocks, Earth rocks, and meteorites. e. None of the other choices are correct.
It can be concluded from Gauss's law for magnetism that
A) south magnetic poles do not exist. B) isolated magnetic poles sometimes exist. C) north magnetic poles do not exist. D) magnetic poles are pairs of electric charges. E) isolated magnetic poles do not exist.
Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 3200 K?
a. There is no hydrogen in stars this cool. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.
Most ancient cultures believed that the Earth was
A) spherical and moving through space B) flat and moving through space C) spherical and motionless D) flat and motionless