The redshift due to the Doppler effect is caused by sources of light obscured by interstellar dust. sources of light moving away from the Solar System. an effect not yet believed to be understood. sources of light moving at right angles to the Solar System. sources of light moving toward the Solar System.

The redshift due to the Doppler effect is caused by sources of light obscured by interstellar dust. sources of light moving away from the Solar System. an effect not yet believed to be understood. sources of light moving at right angles to the Solar System. sources of light moving toward the Solar System.

Astronomy

1st Edition

ISBN:9781938168284

Author:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Publisher:Andrew Fraknoi; David Morrison; Sidney C. Wolff

Chapter24: Black Holes And Curved Spacetime

Section: Chapter Questions

Problem 6E: A student becomes so excited by the whole idea of black holes that he decides to jump into one. It...

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Similar questions

Black holes with masses smaller than those formed in supernovas may have been created in the Big Bang.Calculate the radius of one that has a mass equal to the Earth’s.
It is believed that there is a black hole with a mass of approximately four million times the mass of the Sun near the centre of the Milky Way galaxy. Some stars are relatively close to this black hole. Assume that the semi-major axis of the orbit of one of these stars is 3.5 light days (ie. The distance that light would travel in 3.5 days).a) Find the orbital period of the star. (In years)b) Find the orbital speed of the star (in km/s), assuming that it is in a circular orbit.
Assume 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?
A star is observed to undergo circular orbit around the black hole located at the centre of the Milky Way galaxy. The orbital period is measured to be 16 years and the distance between the star and the black hole is determined to be 1000 Astronomical Units. Estimate the mass of the black hole in units of the Solar mass, and explain any approximations you make in your calculation.
Many galaxies have supermassive black holes at their centres.As material swirls around such a black hole,it is heated,become ionized and generates strong magnetic fields.the resulting magnetic forces steer some of the material into high speeds jets that blast out of the galaxy and into intergalactic space.The light we observe from the jet in fig.has frequency of 6.66(10^14 hz) (in the far ultra voilet region of the electromagnetic spectrum)but in the reference frame of the jet material the light has frequency of 5.55(10^13 hz)(in the infrared).What is the speed of the jet material with respect to us?
Despite strong theoretical arguments for the existence of neutron stars and black holes, many scientists rejected the possibility that such objects could exist until they were confronted with very strong observational evidence. Some people claim that this type of scientific skepticism demonstrates an unwillingness on the part of scientists to give up their deeply held scientific beliefs. Others claim that this type of skepticism is necessary for scientific advancement. What do you think? Defend your opinion.
Use 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 ?
The Schwarzschild radius RBH for an object of mass M is defined as (See image.) where c is the speed of light and G is the universal gravitational constant. RBH gives the radius of the event horizon of a black hole with mass M. In other words, it gives the radius to which some amount of mass M would need to be compressed in order to form a black hole. 1. The mass of the Sun is about 1.99 × 1030 kg. What would be the radius of a black hole with this mass? 2. The mass of Mars is about 6.42 × 1023 kg. What would be the radius of a black hole with this mass? 3. Suppose you want to make a black hole that is roughly the size of an atom (take RBH = 1.10 x 10-10 m). What would be the mass M of such a black hole?
True or false The escape speed from a black hole would be greater than the speed of light. If the impact time of a collision is increased, the force of impact will decrease. A size of a Kelvin degree (oK) is larger than a Celsius degree (oC).
After consuming all of its nuclear fuel, a massive star can collapse to form a black hole, which is an immensely dense object whose escape speed is greater than the speed of light. Newton's law of universal gravitation still describes the froce that a black hole exerts on objects outside it. A spacecraft in the shape of a long cylinder has a length of 100m, and its mass with occupants is 1000kg. It has strayed too close to a black hole having a mass 100 times that of the sun. If the nose of the spacecraft points toward the center of the black hole, and if the distance between the nose of the spacecraft and the black hole's center is 10km (a) determine the total force on the spacecraft. (b) What is the difference in the force per kilogram of mass felt by the occupants in the nose of the ship versus those in the rear of the ship farthest from the black hole?
According to a model described in the text, a neutron star has a radius of about 10 km. Assume that the pulses occur once per rotation. According to Einstein’s theory of relatively, nothing can move faster than the speed of light. Check to make sure that this pulsar model does not violate relativity. Calculate the rotation speed of the Crab Nebula pulsar at its equator, given its period of 0.033 s. (Remember that distance equals velocitytime and that the circumference of a circle is given by 2pR).
Is the event horizon of a black hole the actual physical surface of the object?