The maximum mass limit for a ________________ is 1.4 solar masses. a. red dwarf b. white dwarf c. neutron star d. black hole
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Q: 2) What happens when one of the star ina binary system becomes a black hole.
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Q: Schwarzschild radius of this black hole
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Q: What type of star has the longest life span? a. O b. K c. B d. A e. M
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A: Spiral tracers are objects that are commonly found in spiral arms and soare used to trace spiral…
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red dwarf
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white dwarf
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neutron star
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black hole
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- A Cepheid variable has a period of 17 days and an average apparent magnitude of 23. Find its distance from us. The absolute magnitude of the Sun is 4.83. A. 3 Mpc B. 0.3 Mpc C. 30 Mpc D. 300 Mpc Is the answer D? Thanks!Which of the following observatories is most likely to discover a black hole in a binary system? A. the Chandra X-Ray Observatory B. the SOFIA airborne infrared observatory C. the Arecibo Radio Observatory D. the Hubble Space Telescope17. Which of the following statements BEST describes a black hole? use? A. It does not allow light to enter. O B. It is located at the center of a galaxy. O C. It is so dense that not even light can escape O D. It is the death of a massive red supergiant star.
- A helium flash occurs a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate electrons in the core do not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. under none of the above conditions.Suppose you drop a clock toward a black hole. As you look at the clock from a high orbit, what will you notice? Time on the clock will run faster as it approaches the black hole, and light from the clock A. will be increasingly blueshifted. B. The clock will fall toward the black hole at a steady rate, so that you'll see it plunge through the event horizon within just a few minutes. C. The clock will fall faster and faster, reaching the speed of light as it crosses the event horizon. D. Time on the clock will run slower as it approaches the black hole, and light from the clock will be increasingly redshifted.Answer..
- 38 An AGN hosts a central Black Hole of mass 5×10 kg. The AGN emits at 1/6 of the Eddington limit. Find the luminosity of the AGN. Give your answer in Watts to 3 significant figures.Which of the following stars are bright and very cool. A. White dwarfs B. Our sun C. GiantsPulsars result from a. expanding red giant stars b. white dwarf supernovas c. spinning neutron stars
- 2GM What is the escape velocity (in km/s) from the surface of a 1.6 Mo neutron star? From a 3.0 M. neutron star? (Hint: Use the formula for escape velocity, V. ; make sure to express quantities in units of meters, kilograms, and seconds. Assume a neutron star has a radius of 11 km and assume the mass of the Sun is 1.99 x 1030 kg.) 1.6 Mo neutron star km/s 3.0 Me neutron star km/sWhich type of star would be the largest? a. M b. O c. B d. K e. A2GM What is the escape velocity (in km/s) from the surface of a 1.1 Mo neutron star? From a 3.0 M, neutron star? (Hint: Use the formula for escape velocity, V. = make sure to express quantities in units of meters, kilograms, and seconds. Assume a neutron star has a radius of 11 km and assume the mass of the Sun is 1.99 x 1030 kg.) 1.1 Me neutron star km/s 3.0 M. neutron star km/s