What do we mean by the event horizon of a black hole?
A) It is the boundary within which events in the black hole cannot influence events in the outside universe.
B) It is the center of the black hole.
C) It is the "bottomless pit" of the black hole.
D) It is the place where time begins to slow down as you approach a black hole.
A) It is the boundary within which events in the black hole cannot influence events in the outside universe.
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An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage and current are present in the secondary?
What will be an ideal response?
Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. (c = 3.0 × 108 m/s) (a) What is the index of refraction of this liquid? (b) What is the frequency of the light in air?
What will be an ideal response?
Which of the following are typically found in the halo of our galaxy?
A) open star clusters B) stars of spectral types O and B C) globular star clusters D) cold gas and dust E) all of the above
The orbits of Population II stars have been compared to
A) satellites around planets. B) the accretion disc around a black hole. C) binary stars. D) planets around the Sun. E) comets around the Sun.