When light passes from a material with a low index of refraction into material with a high index of refraction:
a. some light is reflected with a 180° change of phase.
b. none of the light is reflected. c. some light is reflected without a change of phase.
d. the light that is not reflected has a 180° change of phase.
A
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Coulomb's Law: In outer space, a positive charge q is released near a positive fixed charge Q, as shown in the figure. As q moves away from Q, what is true about the motion of q? (There may be more than one correct choice.)
A. It will move with decreasing speed. B. It will move with constant acceleration. C. It will move with increasing acceleration. D. It will move with decreasing acceleration. E. It will move with increasing speed.
Which object is likely to be the coldest? The object whose light spectrum is brightest in the
What is the approximate age of the star cluster in the HR diagram below? (Hint: Main Sequence Stars of spectral between types A and B core supply of hydrogen is sufficient to last about 250 million years. Between A and F about 2 billion years.Type G about 10 billion years. Between K and M about 30 billion years..)
a.
200 million years
b.
2 billion years
c.
10 billion years
d.
30 billion years
e.
The age of the cluster can not be estimated from an HR diagram of the cluster.
Recent evidence from very distant supernova explosions indicates that the universe is expanding
A) at a decreasing rate, and this will eventually turn into an overall contraction. B) at a decreasing rate, but without ever coming to a halt (so that it will expand forever). C) at a decreasing rate, and this will eventually come to a halt with no further expansion or contraction. D) at an unchanging rate. E) at an increasing rate.