Essential Cosmic Perspective
9th Edition
ISBN: 9780135795033
Author: Bennett
Publisher: PEARSON
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Chapter 14, Problem 34EAP
Current evidence indicates that most gamma-ray bursts come from (a) supernovae that leave a black hole behind. (b) unusually massive x-ray bursters. (c) the merger of two black holes
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Why primordial black holes are thought to be extinct?
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Chapter 14 Solutions
Essential Cosmic Perspective
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- true or false A supernova core with a mass 2X that of the Sun produces a Black Holearrow_forwardIf the Sun were to magically, and instantly, become a black hole; what would happen to the Earth’s orbit? How does a supernova happen? What makes it different from your run of the mill nova (i.e. why is it so darn super?)?arrow_forwardUse the Schwarzchild formula, Rs = 2GM/c2 , where Rs = Radius of the star, in meters, that would cause it to become a black hole M = Mass of the star, in kilograms, G = A constant, called the gravitational constant = 6.7 * 10-11m3/kg .s2, c = Speed of light = 3 * 108 meters per second. to determine to what length the radius of the Sun must be reduced for it to become a black hole. The Sun’s mass is approximately 2 * 1030 kilograms ?arrow_forward
- The first confirmed black hole, Cygnus X-1, was regarded as proof that black holes exist because ita. is a compact object in a binary systemb. emits X-rays from a hot accretion diskc. is accreting matter from a main-sequence companion d. has a period of 5.6 dayse. has a mass of ten solar massesarrow_forwardAssume a neutron star has a mass of about 1.2 times the mass of the Sun and a radius of 7 kilometers. Assume the Event Horizon is the size of the Black Hole. What is the density of a Black Hole that has the mass of the Sun?arrow_forwarda)What are the two known sources of gamma-ray bursts? B)In what way do the bursts differ from each other?arrow_forward
- an introduction on what are supermassive black holes?arrow_forwardImagine that you are observing the light from a distant star that is located in a galaxy 100 million lightyears away from you. By analysis of the starlight received, you are able to tell that the image we see is of a 10- million-year-old star. You are also able to predict that the star will have a total lifetime of 50 million years, at which point it will end in a catastrophic supernova. a) How old does the star appear to be to us here on Earth now? b) How long will it be before we receive the light from the supernova event? c) Has the supernova already occurred? If so, when did it occur?arrow_forwardA light of wavelength 620 nm is emitted from the following four places. What wavelength is observed for this light by an observer a long distance away? (The objects are not moving with respect to the observer) The surface of a 0.84 solar mass white dwarf that has a radius of 708000 km: ? The surface of a 2.52 solar mass neutron star that has a radius of 14.2 km: 2 Schwarzschild radii from a 20 solar mass black hole: ? 1.048 Schwarzschild radii from a 20 solar mass black hole: ?arrow_forward
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