Astronomy college course/Introduction to stellar measurements/questions/Original version of this quiz

Questions based on Introduction to Stellar Measurements

1 Stellar parallax is

an annual change in angular position of a star as seen from Earth
an astronomical object with known luminosity.
the total amount of energy emitted per unit time.
a numerical measure of brightness as seen from Earth
a numerical measure of brightness as seen from a distance of approximately 33 light-years

2 Luminosity is

an annual change in angular position of a star as seen from Earth
an astronomical object with known luminosity.
the total amount of energy emitted per unit time.
a numerical measure of brightness as seen from Earth
a numerical measure of brightness as seen from a distance of approximately 33 light-years

3 A standard candle is

an annual change in angular position of a star as seen from Earth
an astronomical object with known luminosity.
the total amount of energy emitted per unit time.
a numerical measure of brightness as seen from Earth
a numerical measure of brightness as seen from a distance of approximately 33 light-years

4 Absolute magnitude is

an annual change in angular position of a star as seen from Earth
an astronomical object with known luminosity.
the total amount of energy emitted per unit time.
a numerical measure of brightness as seen from Earth
a numerical measure of brightness as seen from a distance of approximately 33 light-years

5 Relative magnitude is

an annual change in angular position of a star as seen from Earth
an astronomical object with known luminosity.
the total amount of energy emitted per unit time.
a numerical measure of brightness as seen from Earth
a numerical measure of brightness as seen from a distance of approximately 33 light-years

6 In 1989 the satellite Hipparcos was launched primarily for obtaining parallaxes and proper motions allowing measurements of stellar parallax for stars up to about 500 parsecs away, which is about ____ times the diameter of the Milky Way Galaxy.

.015
0.15
1.5
15
150

7 An object emits thermal (blackbody) radiation with a peak wavelength of 250nm. How does its temperature compare with the Sun?

The temperature is the same
2 times colder than the Sun
2 times hotter than the Sun
5 times colder than the Sun
5 times hotter than the Sun

8 The "normalized intensity" of a Sun-like star situated one parsec from Earth would be 4πI = 1. What is 4πI for a star with 100 times the Sun's energy output that is situated 10pc from Earth?

10-2
10-3
10-1
10-4
1

9 An orbiting satellite makes a circular orbit 5 AU from the Sun. It measures a parallax angle of 0.2 of an arcsecond (each way from the average position). What is the star's distance?

10 parsecs
25 parsecs
5 parsecs
1 parsec
50 parsecs

10 A star that is increasing it's temperature while maintaining constant luminosity is

getting smaller in size
turning red
in the process of dying
on the verge of becoming a supernovae
e) getting larger in size

11 The range of wavelength for visible light is between

400 and 700 nanometers
1 and 10 nanometers
600 and 1200 nanometers
0.1 and 10 nanometers
5000 and 6000 nanometers

12 Based on the HR diagrams and images in stars shown in the materials, a very large red supergiant has a diameter that is about ____ greater than a small white dwarf.

3x103
3x109
3x1011
3x107
3x105