CH8+9 - QUIZ 6 CH 8 + 9 Radius of the event horizon of a...

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QUIZ 6 CH 8 + 9 Radius of the event horizon of a black hole is 8 solar mass About 50% of the stars that we see with the unaided eye are white dwarf. --FALSE The lighthouse theory describes pulsars as rotating neutron stars with large magnetic fields that force fast moving charged particles in two beams originating from the magnetic poles Which of the following is not true: The radius of the event horizon of a black whole of 6 mill M is about 6 Mill km The rapid change in the radiation received from a pulsar are caused by the rapid rotation of the magnetic field of a spinning neutron star. The image shown below is known as the crab nebula. The image represents a supernova remnant or an expanding shell of gas and dust produced after the core of a high mas star collapsed. Most energy produced during a type II supernovae explosion is in the form of neutrinos The lighthouse model of a pulsar is our best explanation of its pulsing radiation In general, planetary nebulas are a 3-dimensional shell of glowing gas Helium fusion requires a greater temperature than hydrogen fusion because: the electrostatic repulsion between the helium nuclei is greater than in hydrogen the spectra of a supernovae type 1a remnants are characterized by the presence of strong hydrogen lines.--FALSE What is Cygnus X-1? A and B It's an x-ray binary system formed by a blue giant star and an invisible object that might be a “black hole with 6 solar masses pg 189 A star may undergo repeated supernova explosions.--FALSE Your friend, has detected a huge explosion in the Magellanic cloud. He thinks it is a supernova type 1a because the spectrum does not contain hydrogen lines. The temperature of an inner accretion disk around a black hole is 10^6K. Thus it radiates strongly at the wavelength of : 2.9nm What is located towards the middle of the image below(Crab Nebula) Neutron Star The core of dying massive star is 25 solar masses might collapse directly into a black hole in what is known as hypernova.--TRUE A pulsar “pulses” because the rotation axis and magnetic axis of the object that produces the pulses are misaligned. The gamma ray sources detected from space are approximately uniformly distributed in the sky.
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This note was uploaded on 10/17/2011 for the course AST 2002 taught by Professor Staff during the Spring '08 term at FAU.

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CH8+9 - QUIZ 6 CH 8 + 9 Radius of the event horizon of a...

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