Resolution: Assuming a pupil diameter of 3 mm, what is the angular resolution of the human eye for light at the middle of the visible spectrum (550 nm)?
A. 0.8°
B. 0.2°
C. 2 mrad
D. 0.01°
E. 2°
Answer: D
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If astronauts could travel at v = 0.95c, we on Earth would say it takes (4.2/0.95) = 4.4 years to reach Alpha Centauri, 4.2 lightyears away. The astronauts disagree. How much time passes on the astronaut's clocks?
a. 1.4 years b. 14.1 years c. 4.0 years d. 1.3 years e. 0.4 years
The oldest rocks on our crust are radioactively dated at about:
A) 200 million years old. B) one billion years old. C) 2.7 billion years old. D) four billion years old. E) 4.6 billion years old.
Which of the following best describes the current status of our understanding of the solar neutrino problem?
A) Experimental evidence indicates that the problem is solved and the expected number of solar neutrinos are indeed being produced by the Sun. B) The problem arose only because experimental data were being misinterpreted; on re-examination, the old data showed that the expected number of neutrinos were being detected. C) We have learned that the Sun's interior undergoes fusion at a lower rate than we had expected, and that is why we had observed fewer neutrinos than expected. D) The solar neutrino problem remains as perplexing as ever, and indeed makes everything we think we know about stars suspect.
A sample of water has a mass of 10.0 grams. What is the number of molecules of water in the 10.0 gram sample (H = 1u, O = 16u)?
a. 
b. 
c. 
d. 
e. 