Physics & Space Science - Introductory Astronomy, Helping Quiz 9

1

The motion of gas in accretion disks and jets is ____. a. well explained by Einstein's theory of general relativity b. poorly understood, but may depend on magnetism c. well explained by Kepler's laws

2

Ultraluminous radio sources associated with small visible-light objects are called _______________

3

A telescope whose primary is a lens and contains no mirrors is a(n) _______ telescope

4

During the first moments of the big bang when elements could be created, nuclear fusion reactions made few heavy elements because

5

Astronomers can use ________ to measure magnetic fields on the Sun

6

In which position(s) of the Moon do we experience the highest high tides?

7

The discovery of the cosmic microwave background was important because

8

Which of the following is evidence that solar activity affects Earth's climate?

9

Generally speaking, how does the surface temperature and luminosity of a protostar compare to the surface temperature and luminosity of the main-sequence star it becomes?

10

What is Newton's Second law of motion?

11

Suppose you had molecular oxygen (O2) chilled enough so that it was in liquid form. Which of the following best describes the phase changes that would occur as you heated the liquid oxygen to high temperature?

in Physics & Space Science

A) It would vaporize (evaporate) into a gas, then the molecules would dissociate into individual oxygen atoms, then the atoms would become increasingly ionized as you continued to raise the temperature.
B) The liquid molecules would quickly dissociate into a liquid of individual oxygen atoms. These atoms would then vaporize (evaporate) into a gas, and then become ionized to make a plasma.
C) It would vaporize (evaporate) into a gas, then the molecules would lose electrons until no electrons were left, then the molecules would dissociate into individual oxygen nuclei.
D) The liquid oxygen first would solidify. The solid would then vaporize (sublimate) into a gas, which would then become a plasma as the molecules lost their electrons, until finally it consisted of bonded pairs of oxygen nuclei stripped bare of any electrons.

12

Approximately, what basic composition are all stars born with?

13

The motion of the tectonic plates is driven by

14

A negative velocity, approaching zero, represents a negative acceleration

15

You discover a binary star system in which one member is a15MSun main-sequence star and the other star is a 10MSun giant. How do we believe that a star system such as this might have come to exist?

16

The process by which small debris condenses into planetesimals is ________

17

Determine the number of significant figures in 0.055 cm

18

Most of the extrasolar planets found so far were detected by

19

Differences among AGNs as viewed from different inclination angles is known as a ________________

20

According to Kepler results in mid-2013, what fraction of stars host an Earth-size planet?

21

Since the difference in energy between the different rotational states in a molecule is very small, many molecular lines can be observed with:

22

Relate differentiation to Saturn's excess internal heat

23

The NASA orbiter that ultimately landed on the surface of the asteroid Eros was:

24

The extent of thermal escape in a planetary atmosphere is dependent

25

The Sun's density is about the same as Saturn's

26

According to our definition, we have been a technological civilization for about:

27

How is it possible that life cycles of stars are so well understood and tested, even though they can take billions of years to happen?

28

If an extrasolar planet suddenly became larger in radius, but kept the same mass and orbit, what would change in the observed Doppler shift of the star?

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Physics & Space Science - Introductory Astronomy, Helping Quiz 9

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