How can the density of the Sun be measured?
by using the density of hydrogen as measured on Earth
by analyzing samples of the solar wind
by using the amount of area covered by Venus during a transit
by using Newton’s laws and the Sun’s diameter
What is the definition of Absolute Zero?
zero degrees Celsius
the temperature at which no thermal energy can be extracted from atoms
the temperature at which water freezes
the temperature at which molecules split into atoms
The temperature of an object is 273K. What is the temperature in degrees Celsius?
The temperature of an object is 373K. What is the temperature in degrees Celsius?
What is the temperature of an object from which no heat energy can be extracted?
The surface temperature of the Sun is about 5800K. Based on this temperature, what is the expected peak wavelength of radiation?
Which of the following measures the average speed of the particles (atoms or molecules) in a gas?
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?
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?
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?
What is the sequence of star colours in order of increasing temperature?
red, yellow, blue
red, blue, yellow
yellow, blue, red
blue, yellow, red
Is it possible for a red star to emit more energy than a blue star?
No, because the red star has a lower temperature.
Yes, if the red star has a larger area.
Yes, if the red star has a larger wavelength of maximum intensity.
No, because red stars are less massive than blue stars.
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)
What is the explanation for the pattern of granulation seen on the visible surface of the Sun?
The granules form the base of a circulation pattern that extends from the photosphere to the outer corona.
The granules are regions of nuclear energy generation in the Sun
Each granule contains a strong magnetic field, which compresses and heats the gas underneath it.
The granules are the tops of hot gases that have risen from the Sun's convective Zone
What is found in the centers of granules?
hot material rising to the photosphere from below
cool material falling from the photosphere to the regions below
material that is fainter and hotter than its surroundings
material that is brighter and cooler than its surroundings
What is responsible for binding the electrons to the nucleus?
Which of the following is a set of rules that describes how atoms and subatomic particles behave?
What is the lowest energy level in an atom called?
The absolute zero temperature
The ionization level
The energy level from which the Paschen series of hydrogen originates
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?
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
Which of the following can be determined from the spectrum of a star, without additional information?
velocity across the sky
Which of the following is a property of the Sun’s chromosphere?
produces a coronal filtergram
is below the visible surface of the Sun
is above the corona
hotter than the photosphere
A boy has mass equal to 35 kg on the surface of the Earth? What is his weight on the surface of the sun?