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Astronomy final exam

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1.
1 point
The shape of an ellipse is described by the (blank) and when this parameter is zero, the ellipse is (blank)
2.
1 point
At the horizon of a black hole, more massive black holes have
3.
1 point
A spectrum which mostly shows flux varying smoothly over a wide range in wavelengths, but which also has specific wavelengths at which flux is missing, is called
4.
1 point
The spectral lines of a star are observed to be shifted toward the blue. Therefore
5.
1 point
If the mass of the Earth were doubled, while its radius remained the same, the escape velocity from the Earth's surface would
6.
1 point
A black body emits an amount of radiation from each unit area of its surface that is proportional to
7.
1 point
Who first discovered the moons of Jupiter?
8.
1 point
The color of a glowing blackbody depends on
9.
1 point
An astronaut in a space shuttle is weightless while the shuttle is orbiting Earth because the
10.
1 point
The often used analogy of a ball rolling down a hill is an example of
11.
1 point
If you are on the Moon, where there is no atmosphere, and you drop a feather (very light) and a hammer (very heavy) at the same time, the
12.
1 point
Photon A is five times more energetic than photon B. This means that for photon A, compared to photon B,
13.
1 point
The present picture of the solar system is contained in the three laws of planetary motion established by
14.
1 point
Fred is watching a train carry Ginger at velocity 3c/4 where c is the speed of light. In her reference frame, Ginger throws a baseball in the direction the train is moving at velocity 3c/4. Fred sees the baseball moving...
15.
1 point
In an atom, energy is emitted or absorbed in a spectral line when
16.
1 point
`The tides in the Earth's oceans are primarily due to the gravity of the (blank) on the Earth's near side and the gravity of the (blank) on Earth's far side.
17.
1 point
Which of the following forces is at its weakest?
18.
1 point
Comet C and Comet D are the same distance from the Earth. If comet C is 1 million km long, comet D is 2 million km long, and comet D subtends an angle of 6 degrees from the Earth.
19.
1 point
If I approach a black hole and take a look around the sky, I will see
20.
1 point
How does F, the flux from the light source, depends on D, the distance from you, and on L, the luminosity of the light source?
21.
1 point
The aspect of the photoelectric effect that was hard to understand, and that Einstein explained, was that is occured only
22.
1 point
Kepler's first law describes the shapes of planetary orbits to be
23.
1 point
Ginger's rocket passes Fred's spaceship at constant velocity, v. Fred sets off a firework to say hello. Ginger sees the light expanding
24.
1 point
Which is not a prediction of the theory of relativity?
25.
1 point
Atoms are composed of
26.
1 point
The spectral lines of hydrogen atoms are very different from the lines of helium atoms because in hydrogen
27.
1 point
At the moment a planet is at the closest point to the Sun and its orbit, it
28.
1 point
Fred and Ginger just purchased identical cars. Ginger drives off the lot at a constant velocity while Fred is still parked. What do they see as the width of the other's car perpendicular to the velocity?
29.
1 point
If an object is accelerated, what must change?
30.
1 point
According to Newton's first law of motion, an object which has no force acting on it will have a
31.
1 point
The term 'velocity' differs from the term 'speed' in that is implies not only a (blank) of motion as does 'speed', but also a (blank) of that motion
32.
1 point
The Schwarzchild radius of a black hole equal in mass to the Sun is
33.
1 point
Newton's law of gravitation states that the attractive force between any two masses in space is in proportion to the (blank) of the masses and in (blank) proportion to the square of the distance between them.
34.
1 point
A person with a mass of 90 kg goes to the Moon. That person's mass on the Moon is
35.
1 point
Two objects with the same mass travel through space, one moving twice as fast as the other. According to Newton's laws, if the same force is applied to both objects, which one accelerates more?
36.
1 point
Kepler's second law states that the line joining the Sun to a planet
37.
1 point
To provide a correct description of black holes we must use
38.
1 point
The factor which distinguishes one element from another is
39.
1 point
When you throw a ball up in the air and carefully measure its motion, which always stays constant?
40.
1 point
Of the following types of electromagnetic radiation, that with the shortest wavelength is
41.
1 point
A radioactive elements has a half life of one million years. If I start out with 4 kg of this elements, how much will be left after two million years?
42.
1 point
The curvature of space-time can cause initially parallel paths (geodesics) to converge or diverge. If they start to diverge, I know space time is
43.
1 point
If a planet moved around the Sun is perfectly circular orbit, it would
44.
1 point
Io, Jupiter's inner satellite discovered by Galileo, orbits a little farther from Jupiter than our Moon is from Earth. Why is Io's orbital period much shorter than our Moon's?
45.
1 point
Light is
46.
1 point
If the force of the Sun's gravity were suddenly turned off
47.
1 point
Kepler's third law relates planetary orbital period (P) to orbital sizes (a) with the following equation
48.
1 point
I am holding a weight stationary in my hand. Gravity is pulling on the weight with a force of ten pounds. How much do I exert to keep the weight from moving?
49.
1 point
If the average speed of the atoms and molescules of gas in a box increases, then the
50.
1 point
In Einsten's Special Theory of Relativity, the speed of light in vacuum
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