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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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
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