In order to understand the concept of temperature it is necessary to understand
a. the zeroth law of thermodynamics.
b. the first law of thermodynamics.
c. the second law of thermodynamics.
d. all of the above.
e. only (b) and (c) above.
a
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Which of the following does not describe a method of achieving polarization?
1.Light hits a reflective surface at a particular angle, dependent on wavelength and index of refraction. The light which reflects is polarized in one direction, and the light which is transmitted is polarized perpendicular to the reflected light. 2.Unpolarized light encounters material made of parallel long-chain molecules. The portion of the light in line with the chains is transmitted; the rest is absorbed. 3.Light collides with air or other gas molecules, which absorb the energy. Electrons inside the molecule begin to vibrate, emitting polarized light much like a radio antennae. 4.Light is sent through an optically active material.
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.
Earth's gravity attracts a person with a force of 120 lbs. The force with which the Earth is attracted towards the person is
A. small but not zero. B. zero. C. billions and billions of tons. D. 120 lbs.
A strobe photograph shows equally spaced images of a car moving along a straight road. If the time intervals between images is constant, which of the following cannot be positive?
a. the speed of the car c. the acceleration of the car b. the average velocity of the car d. the direction of motion of the car