Select the statement that BEST describes core collapse and rebound (\"bounce\")
ID: 304954 • Letter: S
Question
Select the statement that BEST describes core collapse and rebound ("bounce") within a dying, massive star. A. As the core collapses, the concentrated magnetic and electric fields produced by the collapse sling material 21) outward, causing it to bounce away from the core. B. As the core collapses, the electrons and protons combine to form neutrons. As the collapse continues, the core becomes so highly compressed that the neutrons form a barrier that halts the collapse. The innermost part of the core stops collapsing and rebounds slightly as the barrier takes shape. C. As the core collapses, the increased density of the material creates a huge localized gravitational field, which slings the material outward, causing it to bounce way from the core. D. As the core collapses, a temporary rapid expansion of the core to twice its original size causes the core to expand outward 22) Although core bounce probably helps some to eject the outer layers of a High Mass star in an event called a it is most likely that that the huge amount of produced when the electrons and protons combine to form the neutrons in this High Mass star are the main factor driving the shock wave that propels the outer layers of the star into space. A. Supernova, neutrinos B. Nova, neutrinos C. Helium flash, neutrinos D. Deflagration, neutrinos 23) If the Sun were magically to turn into a black hole of the same mass, Earth's orbit would ...? A) Remain the same -the Earth would not notice any change B) The Earth would be sucked into the Sun by the increased gravity C) The Earth would drift way from the Sun D) The Earth's rate of rotation wpuld increase 24) Why is the surface of a black hole called the Event Horizon? A. Because it is the last location around a Black Hole that an observer would be able to see anything happening. B. Because it is where an observer can see the first light escaping from the Black Hole. C. Because it is the first place where matter falling into the Black Hole would collect. D. Because it is where the pair particle production occurs, an important event around Black Holes.Explanation / Answer
21) C
when the core of the stars run out of fuels it start to collapse under the gravity pull till the temperature at which helium can burn in to carbon in ordinary stars.
22)A
supernova stage occurs during the last stellar evolutionary time of a star, end with a explosion and a large quantity of neutrino particles are produced in this process so we can detect it with the neutrino observatories.
23)A
since the mass remains the same, sun will curve the space time as it before, so there will not be any change in the earths orbit.
24)B
with in the event horizon nothing can escape from the gravitational field of black hole.
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