At which of the following temperatures would one liter of water weigh the most?
A. 2°C
B. 4°C
C. 8°C
D. 90°C
E. It would weigh the same at all these temperatures.
Answer: B
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Thin Films: A thin uniform film of oil that can be varied in thickness covers a sheet of glass of refractive index 1.52. The refractive index of the oil is 1.64. Light of wavelength 555 nm is shone from air at normal incidence on the film. Starting with no oil on the glass, you gradually increase the thickness of the oil film until the first interference maximum in the reflected light occurs. What is the thickness of the oil film at that instant?
A. 139 nm B. 169 nm C. 183 nm D. 84.6 nm E. 91.3 nm
Olbers' paradox asks
A. Why isn't the night sky bright as day? B. How can the Universe be younger than some of the stars in it? C. If dark matter is dark, how can we ever see it? D. Which is the simplest cosmological model?
A series circuit consists of three identical lamps connected to a battery as shown in Figure OQ28.15. The switch S, originally open, is closed. What then happens to the brightness of lamp B?
What makes a system disordered?
a. It is arranged according to a different organization than the one you need to examine. b. It is rearranged into a new organization. c. Its arrangement is unique. d. It has many different equivalent arrangements. e. It has only a small number of possible equivalent arrangements.