A one-way mirror works because of
a. interference
b. diffraction
c. its surfaces being half-silvered
d. dispersion
e. polarization
C
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When material expanding away from a star in a binary system leaves a star’s Roche lobe,
a. the material will start to fall back toward the star.
b. all of the material will accrete on to the companion.
c. the material is no longer gravitationally bound to that star.
d. the material will increase in temperature an eventually undergo thermonuclear fusion.
e. c and d.
The electromagnetic spectrum arranged by increasing wavelength is
A. radio waves, gamma rays, x-rays, visible light, infrared, microwave, ultra violet. B. x-rays, gamma rays, ultraviolet, visible light, infrared, microwave, radio waves. C. infrared, gamma rays, x-rays, ultraviolet, visible light, microwave, radio waves. D. gamma rays, x-rays, ultraviolet, visible light, infrared, microwave, radio waves.
Someone shakes a string to create a wave. The string is tied to the other side of a room. The wave takes 2.0 seconds to propagate from one end of a room to the other. If this experiment is repeated, how could the wave be made to travel across the room in 4.0 seconds?
1.Shake the string half as quickly. 2.Shake the string with vibrations that are half the amplitude. 3.Double the string tension. 4.Quarter the string tension.
The ratio of the specific heat of an ideal gas at constant volume to its specific heat at constant pressure is:
A. R B. 1/R C. dependent on the temperature D. dependent on the pressure E. different for monatomic, diatomic, and polyatomic gases