An aluminum foil 0.10 mm thick has how many aluminum atoms per square cm? (The density of aluminum is 2.7 × 103 kg/m3 and the atomic mass of aluminum is 27.)
A) 6 × 1017
B) 6 × 1020
C) 6 × 1024
D) 6 × 109
E) 6 × 1030
B
Physics & Space Science
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Fill in the blank(s) with correct word
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________ is the smallest of the terrestrial planets.
A. Mercury B. Earth C. Venus D. Pluto E. Mars
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The beam in a cathode-ray tube is composed of
A) photons. B) electrons. C) both of these D) neither of these
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A beam of protons is sent through a target and 60% get through. If the target then has its thickness doubled, what percent of the beam would then get through?
A) 20% B) 36% C) 40% D) 60% E) 80%
Physics & Space Science