Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
A. diffract the light through a single slit.
B. squint while looking in that direction.
C. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction.
D. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction.
E. reflect the rays from that direction on a shiny metal surface.
Answer: C
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An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?
a. gas c. solid b. liquid d. substance undergoing a change of state
A heavy bus bar is 20. cm long and of rectangular cross-section, 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries 4000. A? (The resistivity of copper is 1.69 × 10-8 ?-m.)
What will be an ideal response?
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 2.0 cm from the center of the two surfaces?
a. 1.1 N/C b. 4.5 N/C c. 1.4 N/C d. 5.6 N/C e. 0.50 N/C