Exam 14: Down the Rabbit Hole: Relativity and Black Holes

A black hole,originally with a mass of 10³ MSᵤn,accretes gas and grows so that its event horizon increases in radius by a factor of 10.What is the final mass of the black hole?

How did physicists try to detect the luminiferous aether in the late 19th century?

Experiments to measure the properties of the luminiferous aether were problematic for scientists in the early 20th century because there was no evidence for:

Where do supermassive black holes typically live?

Which of the following is essential for galactic jets?

What kind of stars are most likely to form black holes?

What are black holes?

The first evidence for supermassive black holes at the centers of galaxies came from:

Imagine that a spaceship is traveling at half the speed of light relative to an observer.The spaceship shoots a laser in the direction of its motion.How fast is the laser traveling relative to the observer?

In which wavelength range is material falling into stellar-mass black holes most likely to be detected?

What stops the collapse of the most massive stars at the end of their lives?

What is the observational evidence that black hole jets are launched very close to the event horizon?

The figure below shows a relativistic jet of material escaping an astronomical object.The jet is represented by the twisted gray columns.What is represented by the twisted lines and orange disk? What is at the center of such a system?

How do the laws of physics change for moving observers?

According to the general theory of relativity,gravity:

Which of the following effects must be accounted for to make accurate measurements with global positioning system satellites?

If the speed of light were infinite,how would black holes change?

Which of the following sets of numbers completely characterizes a black hole?

An airline pilot spends a considerable fraction of his life traveling at a speed of several hundred kilometers per hour relative to his identical twin brother.How does the pilot's lifetime compare to that of his brother,all other things being equal?

Three identical clocks are held by observers moving as shown in the figure below.Compare the rates at which the three clocks tick,as measured by observer B.