Short-focal-length lenses and mirrors must be strongly curved

a. True
b. False
Indicate whether the statement is true or false


True

Physics & Space Science

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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

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science

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.

Physics & Space Science