A beam of "unpolarized" light
A. has a polarization direction that is constantly rotating.
B. does not have any polarized waves.
C. contains a single light wave with a fixed polarization direction.
D. can be polarized by reflecting it from a flat surface.
Answer: D
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____ has (have) wavelengths that are shorter than visible light. I. Gamma rays II. Ultraviolet light III. Infrared radiation IV. X-rays
a. I & II b. I & IV c. II & III d. II, III, & IV e. I, II, & IV
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT
Which of the following statements about parallax is not true?
A) The existence of stellar parallax is direct proof that Earth orbits the Sun. B) You can demonstrate parallax simply by holding up a finger and looking at it alternately from your left and right eyes. C) Ancient astronomers were unable to measure parallax and used the absence of observed parallax as an argument in favor of an Earth-centered universe. D) Measurement of stellar parallax allows us to determine distances to nearby stars. E) The technique of stellar parallax was used by Hubble to determine that the Andromeda Galaxy (M 31 ) is about 2 million light-years away.
Atmospheric pressure is 1.0 × 10^5 N/m2, and the density of air is 1.29 kg/m3 . If the density of air is constant as you get higher and higher, calculate the height of the atmosphere needed to produce this pressure
a. 7900 m c. 1260 m b. 77,000 m d. 10,300 m