Using the Best Telescopes Under the Best Observing Conditions, the Smallest

Using the best telescopes under the best observing conditions, the smallest angle in the sky that can be resolved from Earth's surface is approximately 0.1 arcsec. (You may wish to review the small-angle formula in Box 1-1 of Universe, 11th ed.) Consequently, the smallest feature that can be resolved at the distance of Uranus is about:

A) 1/400 of the diameter of Uranus.
B) 1/4 of the diameter of Uranus.
C) 4 times the diameter of Uranus.
D) 1/40 of the diameter of Uranus.

Correct Answer:

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