The low surface gravity helps Martian volcanoes grow to great heights
Indicate whether the statement is true or false
TRUE
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An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
A Michelson interferometer is set up for microwaves. Initially the reflectors are placed so the detector reads a maximum. When one of the reflectors is moved 12 cm, the reading goes from a minimum to a maximum six times. What is the wavelength of the microwaves?
A. 0.5 cm B. 4 cm C. 1 cm D. 2 cm
Algol consist of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star. B) The two stars in a binary system should both be at the same stage of life; that is, they should either both be main-sequence stars or both be subgiants. C) It doesn't make sense to find a subgiant in a binary star system. D) A star with a mass of 3.7 MSun is too big to be a main-sequence star.
The square of the wave function represents the
A) position of the particle. B) velocity of the particle. C) probability of finding the particle. D) position of the particle as a function of time. E) probability density for finding particle.