WorksheetsChapter 9 HW
Total questions: 40
Worksheet time: 27mins
Star Z and W both have the same luminosity of 100 lux, if Star Z is 10 ly closer to Earth which star has the lower value for its apparent magnitude?
Star W
Star Z
Both Star Z and W
Which star has the highest apparent *magnitude*?
Sirius
Antares
Our Sun
Polaris the North Star
Apparent (magnitude) brightness is affected by a star's distance from Earth.
False
True
How do the masses of different types of Stars compare?
Hotter Stars are Bigger
Smaller Stars are Hotter
Bigger Stars are Cooler
What forces are balanced in a Main Sequence stars
Gravity
Nuclear Fusion
Work
Space
Young Stars change ___________ into ______________ using _________.
Hydrogen, Helium, Fusion
Helium, Hydrogen, Fission
Water, Earth, Fire
Lead, Gold, Alchemy
What happens to a small star when its main sequence phase is over?
it expands and cools into a red giant.
it explodes and turns into a black hole.
it bleeds off gases and turns into a Planetary Nebula
Why are Blue stars hotter than Red stars?
Blue light has more energy than Red light.
Blue stars are cooler than Red stars
Red stars are bigger than blue Stars
List the Color of a Main Sequence Star from Dim to most Luminous.
Red-Orange-Yellow-White-Blue
Red-Orange-Yellow-Green-Blue-Indigo-Violet
Blue-White-Yellow-Orange-Red
"Apparent Magnitude" is
How bright a star appears from Earth.
How bright the viewer is from Earth
The actual brightness of a star is called _________________
Luminosity
Magnitude
Albedo
Negative Magnitude means _____________.
Brighter Stars
Hotter Stars
Smaller Stars
Closer Stars
The Brightest Star you can see from Earth?
Venus
the Sun or Sol
Sirus
Vega
Which star is the Brightest on the Chart Given
Betelgeuse
Vega
Sirus
GJ75
If Betelgeuse and Sirius were both 1 light year from Earth, which would look the Brightest?
Betelgeuse
Sirius
How do we calculate the luminosity of the Sun?
use the inverse square law
use Einstein's law of mass -energy conversion
use the quadratic equation
use the accekeration formula a = f/m
Which of the following is but the most reliable method for measuring distances to stars that are relatively nearby?
algebraic formulation
geometric parallel
stellar parallax
applying Newton's second law
Which of the following is the best description of the parallax effect?
The parallax effect is the square root of the diameter of the star.
The parallax effect is the apparent motion of a nearby object compared to distance background objects because the change in viewing angle.
The parallax effect is calculated by dividing the star's mass by its volume.
The parallax effect is the distance to a star divided by its intrinsic luminosity.
What is the angle between the Earth at one time of year, and the Earth six months later, as measured from a nearby star, referred to as?
the parallactic angle
the angle of recession
the parallel cosine angle
the critical angle
Which of the following is the closest star to our Sun?
Sirius
Betelgeuse
Proxima Centauri
Rigel
Which of the following is but the most reliable method for measuring distances to stars that are very far away?
spectroscopic parallax
geometric parallel
stellar parallax
applying Newton's second law
The _____ shift in a star’s spectra tells whether a star is moving away or towards the Earth and how fast.
parallax
blue
red
doppler
90% of all stars lie on the _____ region of the H-R diagram.
red giant
main sequence
supergiant
white dwarf
The pressure in a star leads to broader spectral line widths, which can be used to identify what branch the star belongs to in an H-R diagram.
True
False
Knowing the luminosity and the apparent magnitude of a star allows astronomers to calculate the distance to the star.
True
False
