Spectra Flashcards

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1
Q

What is an emission line spectra?

A

Each element produces a unique emission line spectrum because of its unique set of energy levels

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2
Q

What is a continuous spectra?

A

All visible frequencies or wavelengths are present. The atoms of a heated solid metal will produce this type of spectrum.

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3
Q

What is an absorption line spectra?

A

This type of spectrum has series of dark spectral lines against the background of a continuous spectrum. The dark lines have exactly the same wavelengths as the bright emission spectral lines for the same gas atoms

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4
Q

When is an absorption line spectra formed?

A

When light from a source that produces a continuous spectrum passes through a cooler gas.

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5
Q

Why do you get an absorption spectra?

A
  • At low temperatures, most of the electrons in the gas atoms will be in their ground states.
  • Photons of the correct wavelength are absorbed by the electrons to excite them to higher energy levels.
  • These wavelengths are missing from the continuous spectrum when it comes out on the other side.
  • You see a continuous spectrum with black lines in it corresponding to the absorbed wavelengths.
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