Which of the following statements is true?
A: Nothing can travel faster than the speed of light
B: There is a black hole at the center of our Solar System
C: If the Sun were magically to turn into a black hole, Earth's orbit would immediately change
D: Although visible light cannot escape from inside the event horizon of a black hole, high energy radiation, such as gamma rays, can escape
E: Black holes defy the laws of gravity
Ans: A: Nothing can travel faster than the speed of light
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An 05 star has an H? line present in its spectra. What color is the line?
a. red
b. no color as the line is in the UV band
c. blue
d. no color as the line is in the infrared band
What type of meteorite is the most abundant? Most easily found? Why the difference?
What will be an ideal response?
Which of the following energy transport processes involves mass motions of material?
a. radiation b. conduction c. convection d. All of the other choices are correct.
The escape velocity at the event horizon around a black hole is
a. smaller than the speed of light. b. equal to the speed of light. c. much larger than the speed of light. d. irrelevant since nothing (including light) can escape from a black hole.