Natural uranium contains about what percentage of the fissionable isotope 235U?
a. 50%
b. 99%
c. 1%
d. 19%
c
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Total Internal Reflection: Light enters a substance from air at 30.0° to the normal. It continues within the substance at 23.0° to the normal. What is the critical angle for this substance when it is surrounded by air?
A. 53° B. 51.4° C. 36.7° D. 12.6°
Food is cooked faster in a pressure cooker due to its
A) greater rate of bubble formation in the water. B) higher thermal energy. C) higher temperature. D) none of the above
To say that one wave is out of phase with another is to say that the waves are
A) of different amplitudes. B) of different frequencies. C) of different wavelengths. D) out of step. E) all of the above
A layer of water (n = 1.333) floats on carbon tetrachloride (n = 1.461) contained in an aquarium. To the nearest degree, what is the critical angle at the interface between the two liquids?
a. 88° b. 78° c. 66° d. 58° e. 43°