Short-focal-length lenses and mirrors must be strongly curved
a. True
b. False
Indicate whether the statement is true or false
True
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Weight and g: Planet A has twice the mass of Planet B. From this information, what can we conclude about the acceleration due to gravity at the surface of Planet A compared to that at the surface of Planet B?
A. The acceleration due to gravity on Planet A must be twice as great as the acceleration due to gravity on Planet B. B. The acceleration due to gravity on Planet A must be four times as great as the acceleration due to gravity on Planet B. C. The acceleration due to gravity on Planet A is the same as the acceleration due to gravity on Planet B. D. The acceleration due to gravity on Planet A is greater than the acceleration due to gravity on Planet B, but we cannot say how much greater. E. We cannot conclude anything about the acceleration due to gravity on Planet A without knowing the radii of the two planets.
According to special relativity, two events that occur simultaneously in one frame of reference
A) are also simultaneous in all frames of reference. B) can be non-simultaneous in another frame of reference. C) is evidence for the constant speed of light. D) are in reality non-simultaneous.
The spectrum of a(n) ____________________ consists of a continuum and a few highly red shifted emission lines of due to hydrogen
Fill in the blank(s) with correct word
Discrete wavelengths of light are emitted by an excited gas because
a. the speed of light is constant in a given medium. b. light can behave either as a wave or as a particle. c. electron energy levels are quantized. d. the intensity of radiation is proportional to the second power of the frequency.