1. Observations made of Supernova 1987a confirmed that 2. What is true for an ob
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Question
1. Observations made of Supernova 1987a confirmed that
2. What is true for an object that is not quite yet a star but is contracting and there is convection in the object?
3. A certain black hole in our galaxy has a mass that is 5 times the mass of our Sun.
a. hydrogen is created in large quantities during the explosion, and this is likely the reason that the Sun has a high abundance of hydrogen. b. neutrinos carry off most of the energy in the explosion. c. supernovae emit more infrared energy than visible light energy. d. supernovae can create White Dwarf stars.Explanation / Answer
1. Observations made of Supernova 1987a confirmed that neutrinos carry off most of the energy in the explosion.
Option (b) : it will be correct.
Explanation : Neutrinos are elusive particles of very small mass and very high energy which produced in huge quantities in the supernova explosion of a massive star. The chance that a neutrino will interact with an atom is so incredibly small that to detect 10 or 20 of them which means that there must have been about 10 billion neutrinos passing through every square centimeter of Earth.
2. What is true for an object that is not quite yet a star but is contracting and there is convection in the object?
Its surface temperature and luminosity increase.
Option (c) : it will be correct.
Explanation : Since the star is fully radiative which tell us that the surface luminosity (L) increases during contraction.
3. A certain black hole in our galaxy has a mass that is 5 times the mass of our Sun.
c. This black hole will become a neutron star if more mass enters the black hole.
Option (c) : it will be correct.
Explanation : A neutron star is typically from 1.5 to 3 solar masses with a radius of 10 km. More massive neutron stars are more compressed and smaller than lower mass neutron stars.
A black hole can have any mass from about 3 solar masses to billions. The radius of a black hole is proportional to the mass, so that a 3 solar mass black hole has a radius of 9 km, a bit smaller than a neutron star.
With a larger black hole, it is possible for a neutron star to fall in completely, leaving nothing behind. Black holes are usually formed when an extremely massive star dies in a supernova.
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