Absorption and Emission Spectra - OR

Front

What is an absorption spectrum?

Back

An absorption spectrum is a spectrum that shows dark lines or bands superimposed on a continuous spectrum, indicating the wavelengths of light absorbed by a substance.

Front

What is an emission spectrum?

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An emission spectrum is a spectrum of the electromagnetic radiation emitted by a source, showing bright lines or bands at specific wavelengths corresponding to the energy levels of the atoms.

Front

What elements are commonly found in the outer layers of stars?

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Common elements include hydrogen, helium, and carbon.

Front

How can astronomers identify elements in a star's spectrum?

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Astronomers compare the emission lines in a star's spectrum to known emission lines of pure elements.

Front

What does a continuous spectrum indicate?

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A continuous spectrum indicates that all wavelengths of light are present, typically emitted by solid, liquid, or densely packed gases.

Front

What is the significance of the temperature of a star?

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The temperature of a star affects its color, brightness, and the type of elements it can emit.

Front

What class of stars has the highest temperature?

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Class O stars have the highest temperatures.

Front

What happens to light when it passes through a cloud of gas and dust?

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Some wavelengths of light are absorbed by the gas and dust, creating an absorption spectrum.

Front

What is the relationship between a star's temperature and its emission spectrum?

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A star's temperature determines the peak wavelength of its emission spectrum, with hotter stars emitting light at shorter wavelengths.

Front

What is the role of hydrogen in stellar spectra?

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Hydrogen is the most abundant element in the universe and is often a key indicator in the spectra of stars.