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WorksheetsAstrophysics Quiz 1
Total questions: 15
Worksheet time: 11mins
The average distance between the Sun and the Earth is called
Astronomical unit
Parsec
Light year
Parallax distance
Apparent brightness of a star is defined as
energy received per unit surface area
energy received per second per unit surface area
power received per second per unit surface area
power received per second
The nuclear reaction that takes place in the core of the stars is
Nuclear disposition
Nuclear fission
Nuclear fusion
Nuclear composition
Stellar equilibrium means
Radiation pressure inward is greater than gravitational push outward in a star
Gravitational pull inward is greater than the radiation pressure outward in a star
Radiation pressure outward is equal to the gravitational pull inward of a star
Gravitational push outward is equal to the radiation pressure inward of a star
How do stars generate energy?
Fusion of hydrogen to helium atoms
Fission of hydrogen and helium atoms
Fission of helium to hydrogen atoms
Fusion of helium to hydrogen atoms
The Hertzprung Russell Diagram consists of two axis that are labelled...
Luminosity and Size
Luminosity and Temperature
Age and Luminosity
Temperature and Age
Size and Temperature
Luminosity measures _____
the size of a star
the power radiated by a star
the color of a star
the age of a star
In the diagram shown, what happens to a star as it moves to the right?
Stars get smaller
Stars get hotter
Stars get cooler
Stars get brighter
Stars get larger
Astronomers use ____________ to measure the distance from Earth to a nearby star.
luminosity
the parallax angle
apparent brightness
light years
Which of the following is the best description of stellar parallax?
Stellar parallax is the power radiated per unit area and absolute temperature to the fourth power.
Stellar parallax is the apparent motion of a nearby star compared to distant stars due to the 6 month change in the Earth's position.
Stellar parallax says that surface temperature of a star is inversely proportional to the max power wavelength.
Stellar parallax is the luminosity divided by the surface area of the sphere the light has expanded to.
Two stars, G and H have the same apparent brightness but G is closer to Earth. We can tell that . . .
G is larger than H
G is hotter than H
G is more massive than H
G is larger, hotter and more massive than H
None of the other answers
A main sequence star, U, is 20. times more luminous than another main sequence star, V. The ratio of their masses mU/mV is
2.3
35,777.0876
0.43
2.8 x 10-5
Star P has twice the luminosity as star Q; but star Q has twice the apparent brightness as P. The ratio of the distance from Earth of dP / dQ is . . .
2
0.5
1
4
Star C has a luminosity 36 times greater than star D, but they have the same max intensity wavelength. The ratio of their radii rC/rD is . . .
6
0.17
36
1300
A star with a higher surface temperature than another star will always have a . . .
larger radii
higher luminosity
shorter max intensity wavelength
lower mass
