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ASTR 264 Chapter 18
Terms in this set (25)
The upper limit for the mass of a neutron star is about:
3 solar masses.
A black hole is defined as:
a body whose escape velocity is greater than the speed of light.
The aberration of starlight is:
a small circular apparent motion of a star caused by Earth's orbit.
A space ship traveling at one-half the speed of light (0.5c) beams a laser from its front. If you are outside of the ship and measured the speed of the laser, what would be the result?
If a spacecraft could accelerate at a constant rate forever, then:
its speed would get arbitrarily close to but never reach the speed of light.
In order for the speed of light to be constant in all reference frames then:
the passage of time must be different for observers in different reference frames.
In a reference frame that is moving at a velocity near the speed of light, time would pass:
slower relative to a reference frame at rest.
How would the length of a meter stick inside a spacecraft moving at near the speed of light compare to the length of a meter stick in a stationary reference frame?
The moving meter stick would appear to be shorter.
If you were floating inside a spaceship with no windows, how could you tell the difference between 1) being in a constant orbital motion around Earth and 2) moving at a constant velocity in a straight line through space?
In both ships, you would float freely relative to the ship around you with no way to tell the difference.
Which of the following effects predicted by the theory of general relativity has not been confirmed to be correct?
Gravitational waves, a rippling of spacetime caused by a moving massive body.
Light coming from the surface of a massive object will be:
redshifted by the strong gravitational field.
Which of the following properties of a black hole cannot be known?
The point of no return of a black hole, past which no mass or light can escape is called the:
Muons created by cosmic rays striking our atmosphere decay rapidly and so should not be able to reach the ground. How is it we can still detect these muons?
They travel near the speed of light so they experience time dilation.
Which of the following is NOT an inertial frame of reference?
You are accelerating toward a stationary car.
The theory of special relativity says that a stationary mass:
contains an intrinsic amount of energy.
According to Einstein's special relativity, Newtonian physics is:
still applicable but only at low speeds.
A long-duration gamma-ray burst is likely caused by:
the collapse of a rapidly spinning high-mass star.
A black hole which forms from a collapsing massive star has:
mass of at least 3 times the mass of our Sun.
If an object is emitting light and moving toward you, the speed of the light that you receive will be:
at exactly the speed of light in a vacuum.
The fact that you feel weightless during free fall toward Earth and while sitting still in empty space is known as:
the equivalence principle.
According to general relativity, a geodesic is:
the natural path that an object will follow through spacetime.
An area of spacetime distorted by a massive object will:
cause the path of light to bend.
The event horizon of a black hole is:
the radius where the escape velocity is the speed of light.
A black hole can be detected by:
locating rapidly flickering X-rays.
This set is often in folders with...
ASTR 263 Chapter 14
ASTR 264 Chapter 15
ASTR 264 Chapter 16
ASTR 264 Chapter 17
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