For radio reception in city buildings, diffraction is
A) helpful.
B) a hindrance.
C) not a factor.
Answer: A
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Quasars are most common with redshifts
a. less than 0.1 b. less than 0.5 c. of about 2 d. greater than 6 e. greater than 8
Graphical Analysis: The graph in the figure shows the position of a particle as a function of time as it travels along the x-axis.(a) What is the average speed of the particle between t = 2.0 s and t = 4.0 s?(b) What is the average velocity of the particle between t = 2.0 s and t = 4.0 s?
What will be an ideal response?
What is a star's luminosity?
A) the apparent brightness of the star in our sky B) the surface temperature of the star C) the lifetime of the star D) the total energy that the star radiates each second
According to observations, which type of galaxy was much more common when the universe was 2 billion years old than it is today?
A) irregular galaxies B) elliptical galaxies C) spiral galaxies D) We can't say because humans were not alive at that time.