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- Are there different types of black holes?
- Can a star turn into a planet?
- Can gravity form waves?
Step by step
Solved in 2 steps
- As an object falls into a black hole, tidal forces increase. Will these tidal forces always tear the object apart as it approaches the Schwarzschild radius? How does the mass of the black hole and size of the object affect your answer?What would the wavelength of the 21 cm line be for a source moving away from the Earth at 10% the speed of light? What is the source of this 21 cm line?Now look at the two images labeled "At a distance of 2.5M" and "At a distance of 2.1M". These show what happens as you move towards the black hole, looking away from it. What happens to your field of view of everything outside the black hole?
- A star is observed to move away from us at a speed of 2.8km/s. How far is the star ? Express your answer in light years. And the answer is NOT 1.24What is a black body?A 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: ?
- A black hole is a blackbody if ever there was one, so it should emit blackbody radiation, called Hawking radiation. A black hole of mass M has a total energy of MC2, a surface area of 16πG2M2 / c4 and a temperature of hc3 /16π2kGM. Imagine a black hole in empty space, where it emits radiation but absorbs nothing. As it loses energy, its mass must decrease; one could say it "evaporates." Derive a differential equation for the mass as a function of time, and solve this equation to obtain an expression for the lifetime of a black hole in terms of its initial mass.A distant galaxy is observed with a spectrometer. This galaxy produces an emission line that is identified as a Hydrogen transition that normally has a wavelength of 21 cm. For this galaxy, however, the emission line is observed at a wavelength of 33 cm. How fast is this galaxy moving away from us in units of km/s [round off your answer to 1 km/s]A star with the same mass as the Sun orbits around a black hole that is 10 times the mass of the Sun. How does this impact the black hole? O The black hole follows the curved spacetime around the star, just like the star does around the black hole O The black hole is a singularity, so it cannot feel the presence of the star O The black hole takes on an effective mass of 11 times the mass of the Sun O The black hole makes itself larger to consume the star
- What does a black hole sound like?How likely is it for a black hole to collide with Earth? Would we have much warning?Astronomer's know that a certain type of star emits the most light at 100nm. However when the observe a star of that type, they measure a wavelength of 230nm. How fast must that star be traveling, and is it traveling towards or away from the Earth?
