Applications to Astronomy: Estimate the speed of recession of a galaxy that is 10 billion light-years away if H = 20 
? (c = 3.00 × 108 m/s)
A. 0.1c
B. 0.3c
C. 0.5c
D. 0.7c
Answer: D
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For experiments involving the setup shown in figure Q4.1b, which of the following possible results (if seen) regarding the final value displayed by the voltmeter would probably not be consistent with the wave model of light? 
A. It increases as the light’s intensity increases. B. It is independent of the light’s intensity. C. It varies as the light’s wavelength changes. D. It increases as the rate of electron ejection increases.
The Earth is closer to the Sun in January than in July, which accounts for the fact that the highest high tides in the Northern Hemisphere occur in
A) winter. B) spring. C) summer. D) none of the above
The Large and Small Magellanic Clouds fall into class
A) SBc. B) Pec. C) E6. D) Irr I. E) E3.
A long, vertical, metallic wire carries downward electric current. What would be the direction of the field if the current consisted of positive charges moving downward instead of electrons moving upward?
1.north 2.south 3.east 4.west 5.up