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