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

Physics & Space Science

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Which characteristic of Earth explains why Earth has the ozone necessary for an ultraviolet-absorbing stratosphere?

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Which type of mirror can produce a real image?

A. plane B. diverging C. converging D. No mirror can produce a real image.

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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).

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