astronomy chapter 13

question

Which of the following stars is the hottest? a. l star b. b star c. g star d. f star
answer

b. b star
question

Which of the following is a main- sequence star hotter than the Sun? a. A k- type star b. An f-type star c. a c red giant d. a white dwarf
answer

b. an f type
question

In what part of the H-R diagram do white dwarfs lie? a. lower right b. just above the sun on the main sequence c. upper right d. lower center e. upper left
answer

d. lower center
question

if two stars have the same luminosity, but one appears only 1/64 as bright as the other, you can conclude that the dimmer star is ___ times father away. a. 64 b. 512 c. 16 d. 128 e. 8
answer

e. 8
question

What is a parallax?
answer

The apparent shift in position of an object caused by a change in the observer’s position.
question

Star A and star B have the same size, but star A is more luminous than star B. Based on this information, which of the following must be the case? a. star A is cooler then star B b. star A is hotter than star B c. star A and star B have same temperature d. star A is more massive than star B
answer

b. star A is hotter than star B
question

The H-R diagram is a diagram plotting the stars according to their? a. apparent brightness and temperature b. spectral and temperature c. brightness and luminosity d. Luminosity and temperature e. mass and diameter
answer

d. Luminosity and temperature
question

The study of eclipsing binary stars is very important because it allows astronomers to determine? a.the distance between two stars b. the speed of the stars from the doppler shift of their spectral lines. c. the diameter of the stars d. the luminosity of each star e. the brightness of each star
answer

c. the diameter of star
question

which of the following is not true for a pulsating star? a. the surface temperature of a pulsating star changes periodically b. the outer layers of a pulsating star expand and contract periodically c. the luminosity changes periodically d. they show periodic shifts in their spectral lines.
answer

d they are usually members of an eclipsing binary star system.
question

Analysis of stellar spectra shows that most stars consist of 71 %___ 27%___ and a 2% mix of the other elements. a. hydrogen, oxygen b. hydrogen, helium c. helium, hydrogen d oxygen, nitrogen
answer

b. hydrogen, helium
question

The hottest (O and B type) stars are usually binary stars, while the coolest (M type) stars are usually single stars. true or false
answer

true
question

Luminosity (absolute brightness of a star depends on its ___. a. temperature b. radius c. distance from us d. both A and B e. Both A and C
answer

Both A and B temperature and radius
question

If the distance between the Earth and a star is measured using parallax measurements, how far apart in time should the two measurement be made to make the parallax measurement as accurate as possible? a. instantaneously b. a day c. six months d. a year
answer

six months
question

What kind of information can astronomers obtain from the spectrum of a star? more than one answer may be correct. a. the rotation of the star b. the temperature of the star’s atmosphere c. the composition of the star’s atmosphere d. the star’s luminosity
answer

all of them a. the rotation of the star b. the temperature of the star’s atmosphere c. the composition of the star’s atmosphere d. the star’s luminosity
question

In a sample of nearby stars, about what percentage will lie on the main sequence? a.50% b. 99% c.35% d. 95 e. 90%
answer

90%
question

In what part of the H-R diagram do white dwarfs lie? a. upper left b. lower center c. just above the sun on the main sequence d. upper right e. lower right
answer

lower center
question

a star is at a distance of 10.0 parsecs form the sun. what is the distance of this star in light years? a. 3.10 light years b.0.100 light years c.10.0 light years d. 32.6 light years
answer

32.6 light years

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