What two vectors are each the same magnitude as and perpendicular to 
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What will be an ideal response?
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Green light has a shorter wavelength than orange light. In a 5-inch telescope, green light will:
A) provide better angular resolution than orange light. B) come to the same exact focus as orange light. C) provide worse angular resolution than orange light. D) allow dimmer stars to be observed. E) reduce the effects of atmospheric turbulence.
The half-life of a muon is 2.20 ?s as measured in a stationary reference frame. What is the half life of the muon (in ?s) when it is moving with a speed of v = 0.800 c?
a. 8.13 b. 2.75 c. 3.67 d. 15.8 e. 1.32
Have astronomers ever seen a gas cloud that looks like it contains planetary systems that are in the process of forming?
A) Yes, there are many such clouds, including the Orion Nebula. B) Yes, but only the original cloud that formed our own solar system. C) Yes, but only in distant galaxies, not in our own Milky Way. D) No, there is no evidence that any interstellar clouds are currently giving birth to stars.
Given the thickness and chemical composition of Venus's atmosphere, by how much would you expect its average surface temperature to change between day and night?
a. There should be almost no change in temperature. b. by tens of K (like Earth) c. by hundreds of K (like Mercury) d. The answer depends on where Venus is in its orbit around the Sun.