The mutual attraction of gas molecules is an important aspect of:
A) Avogadro's Hypothesis
B) Dalton's Law
C) Graham's Law
D) van der Waals Theory
E) ideal gas law
Ans: D) van der Waals Theory
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What processes are involved in the sunspot cycle?
A) gravitational contraction of the Sun B) wave motions in the solar interior C) variations of the solar thermostat D) the winding of magnetic field lines due to differential rotation E) the interaction of the Earth's magnetic field with that of the Sun
How are wavelength, frequency, and energy related for photons of light?
A) Longer wavelength means higher frequency and lower energy. B) Longer wavelength means lower frequency and lower energy. C) Longer wavelength means lower frequency and higher energy. D) Longer wavelength means higher frequency and higher energy. E) There is no simple relationship because different photons travel at different speeds.
Which law of thermodynamics states that no system can reach absolute zero?
A) First law B) Second law C) Third law D) all of the above
According to the turn-off points of the oldest globular clusters, they are about
A) 4.5 billion years old. B) 6.8 billion years old. C) 10 billion years old. D) 12 billion years old. E) 16 billion years old.