Luminosity is
A) the total amount of light energy that star emits into space.
B) the stars apparent brightness.
C) the stars particular color spectrum output.
D) the stars total infrared output.
Answer: A
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If object A has more mass than object B,
a. A will weigh more than B. b. A will be harder to accelerate than B. c. A will be harder to keep moving in a circle. d. all of the above
The image of an object beneath the surface of a medium of refractive index n> 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
A. real and closer to the viewer than the object. B. virtual and closer to the viewer than the object. C. real and farther from the viewer than the object. D. virtual and farther from the viewer than the object. E. virtual and the same distance from the viewer as the object.
A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz. A spaceship approaches the beacon with a relative velocity of 0.40c. What is the frequency of the beacon radio signal that is detected on the ship?
A) 66 MHz B) 76 MHz C) 55 MHz D) 71 MHz E) 60 MHz
If the photons from blackbody radiator radiation pass through a cool gas, a(n) ____ spectrum is produced
a. absorption b. emission c. continuous d. Doppler e. ionization