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You can find out the identity of an unknown element by analyzing the color of its flame. All the elements give off different colored flames when burned. Using a spectrometer you can analyze a compound and find out what it is made of.
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The importance of the flame spectra because of any light spectrum you can tell what type of element or compound is emitating it.and with that information u can tell what wavelength it should be.for some example with a star if it is travelling away from you,the doppler effect will change its wavelength and you can work out its velocity and direction.
hope it helps;D.
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nahhh...... ill just vote my self
im sleepy its already 12 in noon in here