The percentage of 235U, as a fraction of the total uranium content, in a uranium fission bomb is closest to
A) 50 percent. B) 20 percent. C) 1 percent. D) 90 percent. E) 5 percent.
D
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Thin Lenses: A certain slide projector has a lens of focal length 15.0 cm. This lens forms an image measuring 100 cm × 100 cm on the screen when a slide whose dimensions are 50.0 mm × 50.0 mm is being magnified. How far from the lens should the screen be placed?
Fill in the blank(s) with the appropriate word(s).
Which characteristic of Earth explains why Earth has the ozone necessary for an ultraviolet-absorbing stratosphere?
A) the existence of photosynthetic life B) the existence of plate tectonics C) the moderate surface temperature D) the existence of oceans
Which type of mirror can produce a real image?
A. plane B. diverging C. converging D. No mirror can produce a real image.
The efficiency of a solar cell is the ratio (numerator to denominator) of the ______
a. heat plus electricity produced to the solar input b. light output to the electrical energy input c. electricity output to the heat output d. electricity output to the solar input e. heat input to the electricity output