Welcome to the Quiz!
This quiz contains 14 questions from a mix of 1 subtopics.
What type of spectrum is produced when a hot gas is heated to a high temperature?
line emission spectrum
line absorption spectrum
continuous spectrum
infrared spectrum
|
What happens when electrons fall back down to lower energy levels in a hot gas?
they move to higher energy levels
they absorb energy as photons
they remain at the same energy level
they release energy as photons
|
What determines the particular energies of the photons released by electrons in a hot gas?
the size of the gas atoms
the pressure of the gas
the temperature of the gas
the quantised energy level transitions in that element
|
How can the positions of emission lines be used?
to determine the pressure of the gas
to calculate photon energies using the diffraction grating equation
to measure the size of the gas atoms
to identify the temperature of the gas
|
How is a line absorption spectrum produced?
when a hot gas is heated to a high temperature
when white light passes through a cool, low-pressure gas
when a gas is exposed to infrared radiation
when electrons move to higher energy levels in a gas
|
At lower temperatures, where do most electrons in a gas occupy?
excited states
ground state
higher energy levels
ionized states
|
What happens to photons of specific wavelengths when white light passes through a cool, low-pressure gas?
they pass through the gas unchanged
they are emitted by the gas
they are reflected by the gas
they are absorbed, exciting electrons to higher levels
|
How are emission and absorption spectra related?
they have no relation to each other
absorption lines are always at longer wavelengths than emission lines
emission lines are always at longer wavelengths than absorption lines
absorption lines align with emission lines
|
What does Stefan's Law relate?
A star's luminosity, radius, and temperature
A star's temperature, mass, and composition
A star's luminosity, mass, and radius
A star's mass, radius, and temperature
|
A star emits light with a peak wavelength of 500 nm. Use Wien's Displacement Law to calculate the surface temperature of the star.
5,800 K
6,500 K
5,600 K
4,800 K
|
Calculate the luminosity of a star with a radius of 2 x 108 m and a surface temperature of 3000 K using Stefan's Law.
5.67 x 1025 W
2.31 x 1024 W
3.40 x 1024 W
4.51 x 1026 W
|
A star's spectrum peaks at 800 nm. Estimate the star's surface temperature.
3,250 K
5,125 K
3,625 K
4,000 K
|
If a star's luminosity is 4 x 1026 W and its surface temperature is 4000 K, what is its radius?
2.3 x 109 m
1.5 x 109 m
2.5 x 109 m
1.0 x 109 m
|
Using Wien's Displacement Law, calculate the temperature of a star with a peak wavelength of 250 nm.
8,000 K
10,200 K
12,000 K
11,600 K
|