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Pregunta 1
Pregunta
How can the density of the Sun be measured?
Respuesta
-
by using the density of hydrogen as measured on Earth
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by analyzing samples of the solar wind
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by using the amount of area covered by Venus during a transit
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by using Newton’s laws and the Sun’s diameter
Pregunta 2
Pregunta
What is the definition of Absolute Zero?
Respuesta
-
zero degrees Celsius
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the temperature at which no thermal energy can be extracted from atoms
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the temperature at which water freezes
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the temperature at which molecules split into atoms
Pregunta 3
Pregunta
The temperature of an object is 273K. What is the temperature in degrees Celsius?
Respuesta
-
273
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-273
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0
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373
Pregunta 4
Pregunta
The temperature of an object is 373K. What is the temperature in degrees Celsius?
Respuesta
-
-273
-
-173
-
173
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273
Pregunta 5
Pregunta
What is the temperature of an object from which no heat energy can be extracted?
Respuesta
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0 Kelvin
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100 Kelvin
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100 Celsius
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Celsius
Pregunta 6
Pregunta
The surface temperature of the Sun is about 5800K. Based on this temperature, what is the expected peak wavelength of radiation?
Respuesta
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orange
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green
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yellow
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red
Pregunta 7
Pregunta
Which of the following measures the average speed of the particles (atoms or molecules) in a gas?
Respuesta
-
Heat
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Composition
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Temperature
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Binding energy
Pregunta 8
Pregunta
A plot of the continuous spectra of four different stars is shown in the figure. Based on these spectra, which of the stars is the hottest?
Respuesta
-
A
-
B
-
C
-
D
Pregunta 9
Pregunta
A plot of the continuous spectra of four different stars is shown in the figure. Based on these spectra, which of the stars has the lowest temperature?
Respuesta
-
A
-
B
-
C
-
D
Pregunta 10
Pregunta
The Sun emits its maximum intensity of light at about 520 nm. According to Wien’s Law, at what wavelength would the maximum intensity be for a star with a surface temperature twice that of the Sun?
Respuesta
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260 nm
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1040 nm
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5800 nm
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11600 nm
Pregunta 11
Pregunta
What is the sequence of star colours in order of increasing temperature?
Respuesta
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red, yellow, blue
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red, blue, yellow
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yellow, blue, red
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blue, yellow, red
Pregunta 12
Pregunta
Is it possible for a red star to emit more energy than a blue star?
Respuesta
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No, because the red star has a lower temperature.
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Yes, if the red star has a larger area.
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Yes, if the red star has a larger wavelength of maximum intensity.
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No, because red stars are less massive than blue stars.
Pregunta 13
Pregunta
The Stefan-Boltzmann law says that hot objects emit energy proportional to the fourth power of their temperature. One star has a temperature of 30,000 K and another star has a temperature of 6,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface? (Please see appendix)
Respuesta
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5 times
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25 times
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625 times
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10^15 times
Pregunta 14
Pregunta
What is the explanation for the pattern of granulation seen on the visible surface of the Sun?
Respuesta
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The granules form the base of a circulation pattern that extends from the photosphere to the outer corona.
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The granules are regions of nuclear energy generation in the Sun
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Each granule contains a strong magnetic field, which compresses and heats the gas underneath it.
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The granules are the tops of hot gases that have risen from the Sun's convective Zone
Pregunta 15
Pregunta
What is found in the centers of granules?
Respuesta
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hot material rising to the photosphere from below
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cool material falling from the photosphere to the regions below
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material that is fainter and hotter than its surroundings
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material that is brighter and cooler than its surroundings
Pregunta 16
Pregunta
What is responsible for binding the electrons to the nucleus?
Respuesta
-
Kirchhoff's law
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Wien’s law
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Coulomb's Law
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Balmer series
Pregunta 17
Pregunta
Which of the following is a set of rules that describes how atoms and subatomic particles behave?
Respuesta
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Kirchhoff's law
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Wien’s law
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Quantum Mechanics
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General Relativity
Pregunta 18
Pregunta
What is the lowest energy level in an atom called?
Respuesta
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Ground State
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The absolute zero temperature
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The ionization level
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The energy level from which the Paschen series of hydrogen originates
Pregunta 19
Pregunta
The energy of the first level in an atom is 2.2×10-18 J, and the energy of the second energy level is 1.6×10-18 J. What is the energy of the photon that is emitted if an electron moves from the second level to the first?
Respuesta
-
3.5×10^-36 J
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6.0×10^-19 J
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3.5×10^-18 J
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6.0×10^-18 J
Pregunta 20
Pregunta
The diagram illustrates a light source, a gas cloud, and three different lines of sight (the observer is located at the numbered positions). Along which line of sight would an observer see an absorption spectrum
Respuesta
-
1
-
2
-
3
Pregunta 21
Pregunta
Which of the following can be determined from the spectrum of a star, without additional information?
Respuesta
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radial velocity
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core temperature
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distance
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velocity across the sky
Pregunta 22
Pregunta
Which of the following is a property of the Sun’s chromosphere?
Respuesta
-
produces a coronal filtergram
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is below the visible surface of the Sun
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is above the corona
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hotter than the photosphere
Pregunta 23
Pregunta
A boy has mass equal to 35 kg on the surface of the Earth? What is his weight on the surface of the sun?
Respuesta
-
2678 N
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350 N
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1589 N
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9620.8 N
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