A gray transparent surface has the spectral reflectivity shown. Determine the average reflectivity and transmissivity at 500 K and at 850 K.
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If scientists excavate two fossils at the Grand Canyon, one of which was found at a much deeper rock layer than the other, what can we assume about the fossils?
A) The fossil found in a deeper layer is older. B) The fossil found in a deeper layer is younger. C) The fossil found in a deeper layer is not as well-preserved. D) The fossil found in a deeper layer has a higher carbon-12 abundance.
Consider the right-going wave and the possible left-going waves displayed in problem Q2T.3. For which of the choices will there be an instant where the combined wave is a rectangular wave as shown below? 
A. A B. B C. C D. D E. None of the above
A 0.600-kg piece of metal is heated to 100°C and placed in an aluminum can of mass 0.200-kg which contains 0.500 kg of water initially at 17.3°C
The final equilibrium temperature of the mixture is 20.2°C, what is the specific heat of the metal? A) 140 J/kg ? C° B) 180 J/kg ? C° C) 270 J/kg ? C° D) 450 J/kg ? C° E) 900 J/kg ? C°
Stars in a star cluster
a. all have the same age. b. all have the same chemical composition. c. all have the same luminosity. d. all of the above. e. all have the same age and all have the same chemical composition.