Astronomy college course/Introduction to stellar measurements/questions


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AstroStellarMeasurements_Study
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AstroStellarMeasurements_Study-v1s1
/1/. Stellar parallax is
 * ___ a) a numerical measure of brightness as seen from Earth


 * ___ b) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * ___ c) an annual change in angular position of a star as seen from Earth


 * ___ d) an astronomical object with known luminosity.


 * ___ e) the total amount of energy emitted per unit time.

/2/. Luminosity is
 * ___ a) an annual change in angular position of a star as seen from Earth


 * ___ b) a numerical measure of brightness as seen from Earth


 * ___ c) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * ___ d) an astronomical object with known luminosity.


 * ___ e) the total amount of energy emitted per unit time.

/3/. A standard candle is
 * ___ a) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * ___ b) a numerical measure of brightness as seen from Earth


 * ___ c) an astronomical object with known luminosity.


 * ___ d) an annual change in angular position of a star as seen from Earth


 * ___ e) the total amount of energy emitted per unit time.

/4/. Absolute magnitude is
 * ___ a) a numerical measure of brightness as seen from Earth


 * ___ b) the total amount of energy emitted per unit time.


 * ___ c) an annual change in angular position of a star as seen from Earth


 * ___ d) an astronomical object with known luminosity.


 * ___ e) a numerical measure of brightness as seen from a distance of approximately 33 light-years

/5/. Relative magnitude is
 * ___ a) a numerical measure of brightness as seen from Earth


 * ___ b) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * ___ c) an astronomical object with known luminosity.


 * ___ d) an annual change in angular position of a star as seen from Earth


 * ___ e) the total amount of energy emitted per unit time.

/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.
 * ___ a) 15


 * ___ b) 1.5


 * ___ c) 150


 * ___ d) .015


 * ___ e) 0.15

/7/. An object emits thermal (blackbody) radiation with a peak wavelength of 250nm. How does its temperature compare with the Sun?
 * ___ a) 5 times colder than the Sun


 * ___ b) 2 times colder than the Sun


 * ___ c) 5 times hotter than the Sun


 * ___ d) The temperature is the same


 * ___ e) 2 times hotter than the Sun

/8/. The "normalized intensity" of a Sun-like star situated one parsec from Earth would be 4&pi;I = 1. What is 4&pi;I for a star with 100 times the Sun's energy output that is situated 10pc from Earth?
 * ___ a) 10-2


 * ___ b) 10-3


 * ___ c) 10-1


 * ___ d) 1


 * ___ e) 10-4

/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?
 * ___ a) 25 parsecs


 * ___ b) 5 parsecs


 * ___ c) 50 parsecs


 * ___ d) 1 parsec


 * ___ e) 10 parsecs

/10/. A star that is increasing it's temperature while maintaining constant luminosity is
 * ___ a) getting smaller in size


 * ___ b) on the verge of becoming a supernovae


 * ___ c)e) getting larger in size


 * ___ d) in the process of dying


 * ___ e) turning red

/11/. The range of wavelength for visible light is between
 * ___ a) 5000 and 6000 nanometers


 * ___ b) 1 and 10 nanometers


 * ___ c) 600 and 1200 nanometers


 * ___ d) 400 and 700 nanometers


 * ___ e) 0.1 and 10 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.
 * ___ a) 3x107


 * ___ b) 3x109


 * ___ c) 3x105


 * ___ d) 3x1011


 * ___ e) 3x103

Key to AstroStellarMeasurements_Study-v1s1
/1/. Stellar parallax is
 * - a) a numerical measure of brightness as seen from Earth


 * - b) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * + c) an annual change in angular position of a star as seen from Earth


 * - d) an astronomical object with known luminosity.


 * - e) the total amount of energy emitted per unit time.

/2/. Luminosity is
 * - a) an annual change in angular position of a star as seen from Earth


 * - b) a numerical measure of brightness as seen from Earth


 * - c) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * - d) an astronomical object with known luminosity.


 * + e) the total amount of energy emitted per unit time.

/3/. A standard candle is
 * - a) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * - b) a numerical measure of brightness as seen from Earth


 * + c) an astronomical object with known luminosity.


 * - d) an annual change in angular position of a star as seen from Earth


 * - e) the total amount of energy emitted per unit time.

/4/. Absolute magnitude is
 * - a) a numerical measure of brightness as seen from Earth


 * - b) the total amount of energy emitted per unit time.


 * - c) an annual change in angular position of a star as seen from Earth


 * - d) an astronomical object with known luminosity.


 * + e) a numerical measure of brightness as seen from a distance of approximately 33 light-years

/5/. Relative magnitude is
 * + a) a numerical measure of brightness as seen from Earth


 * - b) a numerical measure of brightness as seen from a distance of approximately 33 light-years


 * - c) an astronomical object with known luminosity.


 * - d) an annual change in angular position of a star as seen from Earth


 * - e) the total amount of energy emitted per unit time.

/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.
 * - a) 15


 * - b) 1.5


 * - c) 150


 * + d) .015


 * - e) 0.15

/7/. An object emits thermal (blackbody) radiation with a peak wavelength of 250nm. How does its temperature compare with the Sun?
 * - a) 5 times colder than the Sun


 * - b) 2 times colder than the Sun


 * - c) 5 times hotter than the Sun


 * - d) The temperature is the same


 * + e) 2 times hotter than the Sun

/8/. The "normalized intensity" of a Sun-like star situated one parsec from Earth would be 4&pi;I = 1. What is 4&pi;I for a star with 100 times the Sun's energy output that is situated 10pc from Earth?
 * - a) 10-2


 * - b) 10-3


 * - c) 10-1


 * + d) 1


 * - e) 10-4

/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?
 * + a) 25 parsecs


 * - b) 5 parsecs


 * - c) 50 parsecs


 * - d) 1 parsec


 * - e) 10 parsecs

/10/. A star that is increasing it's temperature while maintaining constant luminosity is
 * + a) getting smaller in size


 * - b) on the verge of becoming a supernovae


 * - c)e) getting larger in size


 * - d) in the process of dying


 * - e) turning red

/11/. The range of wavelength for visible light is between
 * - a) 5000 and 6000 nanometers


 * - b) 1 and 10 nanometers


 * - c) 600 and 1200 nanometers


 * + d) 400 and 700 nanometers


 * - e) 0.1 and 10 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.
 * - a) 3x107


 * - b) 3x109


 * + c) 3x105


 * - d) 3x1011


 * - e) 3x103


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