What is the minimum thickness of a nonreflecting film coating (n = 1.30 ) on a glass lens (n = 1.50 ) for wavelength 500 nm?
A) 250 nm
B) 221 nm
C) 192 nm
D) 167 nm
E) 96.2 nm
E
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Which of the following statements about an open cluster is true?
A) All stars in the cluster are approximately the same color. B) All stars in the cluster are approximately the same age. C) All stars in the cluster have approximately the same mass. D) All stars in the cluster will evolve similarly. E) There is an approximately equal number of all types of stars in the cluster.
If the surface temperature of the Earth is 290 K and that of the Sun is 6 000 K, assuming the same emissivities, what is the ratio of the energy radiated per square meter of the Earth to that of the Sun?
a. 0.48 b. 2.3 × 10^–3 c. 6.4 × 10^–5 d. 5.5 × 10^–6
For simplicity, a professor uses 9.8 (meters per second) per second for the acceleration due to gravity instead of the more precise 9.81 (meters per second) per second. If Cavendish had made the same approximation, his estimate for Earth's mass have been
A. too high B. too low
Most of Earth's water is in the
A) oceans. B) polar ice caps. C) rivers, lakes, and stream. D) ground.