•The law that the greater the recessional velocity of a galaxy, the farther away the galaxy is called
•
•(a) Shapley’s Law
•(b) Hubble’s Law
•(c) Hertzsprung-Russell’s Law
b
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"Spurs" are probably the result of ____
a. self-sustaining star formation b. spiral density waves c. differential rotation d. the central galactic bar e. the short lifetime of O stars
Thin Films: When a beam of light that is traveling in air is reflected by a glass surface, there is
A. a 90° phase change in the reflected beam. B. no phase change in the reflected beam. C. a 180° phase change in the reflected beam. D. a 60° phase change in the reflected beam. E. a 45° phase change in the reflected beam.
The formation of ice from water is accompanied by:
A. absorption of energy as heat B. temperature increase C. decrease in volume D. an evolution of heat E. temperature decrease
A vessel containing 10 kg of water is left out where it evaporates. If the temperature remains constant at 20°C, what is the change in entropy (in kcal/K)? (The latent heat of vaporization at 20°C is 585 cal/g.)
a. 30 b. 10 c. 20 d. 40 e. 290