The classical model of the hydrogen atom that explains its spectral line structure is due to:
A) Kirchhoff.
B) Bohr.
C) Fraunhofer.
D) Newton.
E) Mendeleev.
B
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Why does Mars have seasons similar to the Earth?
a. Mars is roughly the same distance from the sun as Earth. b. Mars has the same size as the Earth. c. The shape of Mars' orbit is the same as the Earth's. d. Mars' rotational axis is tilted relative to its orbit like the Earth's.
When you touch a piece of ice,
A) work flows from your hand to the ice. B) chemical energy flows from the ice to your hand. C) thermal energy flows from the ice to your hand. D) work flows from the ice to your hand. E) thermal energy flows from your hand to the ice.
A wave on a string has a wavelength of 0.90 m at a frequency of 600 Hz. If a new wave at a frequency of 300 Hz is established in this same string under the same tension, what is the new wavelength?
a. 2.7 m b. 1.8 m c. 0.45 m d. 0.30 m
All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) The axis tilt of Mars is thought to change significantly with time. B) Mars lost any global magnetic field that it may once have had. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.