Podcast
Questions and Answers
What two components primarily comprise a stellar spectrum?
What two components primarily comprise a stellar spectrum?
- A continuous emission spectrum and a line absorption spectrum. (correct)
- A continuous absorption spectrum and a line emission spectrum.
- A continuous emission spectrum and a line emission spectrum.
- A continuous absorption spectrum and a line absorption spectrum.
What is a key characteristic of a black body?
What is a key characteristic of a black body?
- It emits no radiation.
- It reflects all incident radiation.
- It transmits all incident radiation.
- It absorbs all incident radiation. (correct)
How well do stars approximate black bodies?
How well do stars approximate black bodies?
- Stars are perfect black bodies.
- Stars are poor approximations of black bodies due to their complex atmospheric compositions.
- Stars are close approximations of black bodies. (correct)
- Stars do not resemble black bodies at all.
What is the relationship between the peak wavelength and temperature in a black body spectrum?
What is the relationship between the peak wavelength and temperature in a black body spectrum?
Which of the following best describes the origin of the continuous emission spectrum in a star?
Which of the following best describes the origin of the continuous emission spectrum in a star?
What causes the line absorption spectrum observed in stellar spectra?
What causes the line absorption spectrum observed in stellar spectra?
If a star's surface temperature increases, what happens to the peak wavelength of its black body spectrum?
If a star's surface temperature increases, what happens to the peak wavelength of its black body spectrum?
Why are stars considered good approximations to black bodies, but not perfect?
Why are stars considered good approximations to black bodies, but not perfect?
A star appears blue. What can be inferred about its surface temperature compared to a red star?
A star appears blue. What can be inferred about its surface temperature compared to a red star?
If a hypothetical object absorbs all incident electromagnetic radiation, what will happen to its temperature?
If a hypothetical object absorbs all incident electromagnetic radiation, what will happen to its temperature?
How does the density of the gas affect the type of spectrum produced by a star?
How does the density of the gas affect the type of spectrum produced by a star?
What happens to the line absorption spectrum of a star if certain elements are removed from its atmosphere?
What happens to the line absorption spectrum of a star if certain elements are removed from its atmosphere?
Given two stars, Star A with a peak wavelength in the green part of the spectrum and Star B with a peak wavelength in the red part, which star has a higher surface temperature?
Given two stars, Star A with a peak wavelength in the green part of the spectrum and Star B with a peak wavelength in the red part, which star has a higher surface temperature?
Why is the study of stellar spectra important in astronomy?
Why is the study of stellar spectra important in astronomy?
How does the black body spectrum of a star change as it evolves from a young, hot star to an older, cooler star?
How does the black body spectrum of a star change as it evolves from a young, hot star to an older, cooler star?
What would happen to Earth's climate if the Sun suddenly became a perfect black body?
What would happen to Earth's climate if the Sun suddenly became a perfect black body?
How does the presence of an atmosphere around a star affect the observed black body spectrum?
How does the presence of an atmosphere around a star affect the observed black body spectrum?
A star exhibits a black body spectrum with a peak wavelength in the ultraviolet range. What does this indicate about the star?
A star exhibits a black body spectrum with a peak wavelength in the ultraviolet range. What does this indicate about the star?
How can analyzing the width of absorption lines in a stellar spectrum provide information about a star?
How can analyzing the width of absorption lines in a stellar spectrum provide information about a star?
If a star's emitted radiation peaks in the infrared, what does this tell us about its temperature relative to the Sun, which peaks in the visible spectrum?
If a star's emitted radiation peaks in the infrared, what does this tell us about its temperature relative to the Sun, which peaks in the visible spectrum?
Flashcards
Continuous Emission Spectrum
Continuous Emission Spectrum
A stellar spectrum includes a continuous emission spectrum.
Line Absorption Spectrum
Line Absorption Spectrum
A stellar spectrum includes a line absorption spectrum.
Black Bodies
Black Bodies
Objects that absorb all incoming electromagnetic radiation.
Stars as Black Bodies
Stars as Black Bodies
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Peak Wavelength & Temperature
Peak Wavelength & Temperature
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Black Body Spectrum
Black Body Spectrum
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Study Notes
- A stellar spectrum comprises a continuous emission spectrum from the star's dense surface gas.
- It also includes a line absorption spectrum created as electromagnetic radiation passes through the star's atmosphere.
- Black bodies absorb all incident radiation.
- Stars closely approximate black bodies.
- The black body spectrum's shape shows the peak wavelength is inversely proportional.
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