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.
B
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Suppose you live at latitude 40°N. Based on the given right ascensions and declinations, which of the following stars remains above your horizon for the longest time each day?
A) Spica: RA = 13hr 25m, dec = -11°09' B) Deneb: RA = 20hr 41m, dec = +45°16' C) Sirius: RA = 6hr 45m, dec = -16°42' D) Alpha Centauri: RA = 14hr 40m, dec = -60°50' E) Vega: RA = 18hr 37m, dec = +38°47'
Which would require the greater energy; slowing the orbital speed of a satellite so it crashes into Earth, or increasing the orbital speed so it escapes Earth?
A) slowing down B) speeding up C) same each way
An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P?
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A.
B.
C.
D.
E.
When an object is reflected in a plane mirror, the image is always
A. Virtual B. Real C. Inverted D. None of these