Roughly how many stars are within 4 parsecs of the solar system?
A) 3
B) 30
C) 3000
D) 300,000
E) 200 billion
B
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What is the resolving power of a diffraction grating that is capable of just distinguishing between two wavelengths of 568.20 nm and 569.60 nm? (1 nm = 10?9 m)
a. 1.10 b. 406 c. 487 d. 812 e. 568.9
What is one possible reasons Jupiter and Saturn radiate more energy than they receive from the sun?
a. Magnetic and electric fields heat the planet. b. Fusion reactions of hydrogen into helium inside the planet provide an additional heat source. c. The planets are still radiating heat from when they first formed. d. Friction between the planet and its moons heat the planet.
Compared to the photon that enters a pane of window glass, the photon that emerges is
A) the same photon. B) an identical but different photon. C) an altogether different photon. D) none of the above
The water level in identical bowls, A and B, is exactly the same. A contains only water; B contains floating ice as well as water. When we weigh the bowls, we find that
A.
B.
C.
D.
the volume of the water.E.