What is the f-number of a camera lens that has an aperture-opening diameter of 0.20 cm and a focal length of 3.0 cm?
a. 10
c. 15
b. 0.10
d. 0.80
C
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Of the following photons, which has the lowest energy?
a. visible b. ultraviolet c. infrared d. microwave
Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel Prize in physics for their development of a(n)
a. electroweak theory. b. GUT. c. quark theory. d. generalized theory of relativity. e. theory of strangeness.
What is thought to be the cause of Io's volcanoes?
A) Jupiter's magnetosphere and its charged particles B) Jupiter's gravity and the heat it creates C) tidal stresses from both Jupiter and Europa D) solar radiation focused by Jupiter's gravity E) radioactive decay in Io's interior
Assume everyone in the United States consumes one soft drink in an aluminum can every two days. If there are 270 million Americans, estimate how many tons of Aluminum needs to be recycled each year if each can weighs 1/16 pound and one ton = 2000 pounds.
A. 750,000 tons B. 1.5 million tons C. 1.75 million tons D. 3 million tons E. 1,600,000 tons