All the following statements about known extrasolar planets are true. Which one came as a surprise to scientists who expected other solar systems to be like ours?
A) Some of the planets orbit their star more closely than Mercury orbits the Sun.
B) Most of the planets are quite massive—much more like Jupiter than like Earth.
C) Most of the planets orbit stars that are quite nearby compared to the scale of the entire Milky Way Galaxy.
D) In some cases, we've found more than one planet orbiting the same star.
A
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Compton Scattering: A certain photon, after being scattered from a free electron that was at rest, moves at an angle of 120° with respect to the incident direction. If the wavelength of the incident photon is 0.591 nm, what is the energy of the scattered photon? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.05 × 1016 J B. 2.10 × 1016 J C. 5.71 × 1016 J D. 3.34 × 1016 J E. 4.21 × 1016 J
Sunlight reflected from the surface of a lake
A) is unpolarized. B) tends to be polarized with its electric field vector parallel to the surface of the lake. C) has undergone refraction by the surface of the lake. D) tends to be polarized with its electric field vector perpendicular to the surface of the lake. E) is totally polarized.
A thin layer of oil (n = 1.25 ) is on top of a puddle of water (n = 1.33). If normally incident 500-nm light is strongly reflected, what is the minimum nonzero thickness of the oil layer?
A) 100 nm B) 150 nm C) 250 nm D) 200 nm E) 400 nm
Common drainage networks include the
A) rectangular and divide drainage patterns. B) radiating and undulating drainage patterns. C) dentritic, radial, and trellis drainage patterns. D) trellis, subsident, and perched drainage patterns.