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If an astronaut travels inside the event horizon of a black hole, what phenomenon will he observe? O A. He will see the light emitted by stars outside of the event horizon. O B. Light from the world outside the event horizon becomes invisible. OC. The astronaut will encounter a spherical wall of matter. O D. The astronaut will see that all light is redshifted. O E. The astronaut will observe the stoppage of time.

If an astronaut travels inside the event horizon of a black hole, what phenomenon will he observe? O A. He will see the light emitted by stars outside of the event horizon. O B. Light from the world outside the event horizon becomes invisible. OC. The astronaut will encounter a spherical wall of matter. O D. The astronaut will see that all light is redshifted. O E. The astronaut will observe the stoppage of time.

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If an astronaut travels inside the event horizon of a black hole, what phenomenon will he observe? O A. He will see the light emitted by stars outside of the event horizon. O B. Light from the world outside the event horizon becomes invisible. OC. The astronaut will encounter a spherical wall of matter. O D. The astronaut will see that all light is redshifted. The astronaut will observe the stoppage of time. 58 A particle called the pi meson has a lifetime of 18 ns (ns = 10° s) when it is at rest. In a particle accelerator, pi mesons are produced that are moving close to the speed of light. What is the lifetime of the rapidly moving pi mesons? O a The pi mesons have a lifetime much longer than 18 ns if they are moving fast. cross out ut of O b. The pi mesons have a lifetime much smaller than 18 ns if they are moving fast. cross out Oc. The pi mesons have a lifetime that is 18 ns if they are moving CIOSS out fast Od. The pi meson becomes a stable particle and doesn't decay if it is moving fast. cross out 53 Which is the most difficult type of X-ray binary companion star to observe? Select one: but of Low-mass companion stars, because they are so dim relative O a. to the accretion disc. O b. Low-mass companion stars, because they are rapidly destroyed by a black hole. O c. High-mass companion stars, because they lose their material at an extremely high rate to the black hole disc, making it brighter than them. O d. High-mass companion stars, because they expand and cool rapidly when near a black hole.
Transcribed Image Text:If an astronaut travels inside the event horizon of a black hole, what phenomenon will he observe? O A. He will see the light emitted by stars outside of the event horizon. O B. Light from the world outside the event horizon becomes invisible. OC. The astronaut will encounter a spherical wall of matter. O D. The astronaut will see that all light is redshifted. The astronaut will observe the stoppage of time. 58 A particle called the pi meson has a lifetime of 18 ns (ns = 10° s) when it is at rest. In a particle accelerator, pi mesons are produced that are moving close to the speed of light. What is the lifetime of the rapidly moving pi mesons? O a The pi mesons have a lifetime much longer than 18 ns if they are moving fast. cross out ut of O b. The pi mesons have a lifetime much smaller than 18 ns if they are moving fast. cross out Oc. The pi mesons have a lifetime that is 18 ns if they are moving CIOSS out fast Od. The pi meson becomes a stable particle and doesn't decay if it is moving fast. cross out 53 Which is the most difficult type of X-ray binary companion star to observe? Select one: but of Low-mass companion stars, because they are so dim relative O a. to the accretion disc. O b. Low-mass companion stars, because they are rapidly destroyed by a black hole. O c. High-mass companion stars, because they lose their material at an extremely high rate to the black hole disc, making it brighter than them. O d. High-mass companion stars, because they expand and cool rapidly when near a black hole.
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