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How can you use electromagnetic waves within the visible spectrum to identify unknown gases?

How can you use electromagnetic waves within the visible spectrum to identify unknown gases?

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when an unknown gas is passed through visible electromagnetic waves region it absorbs some colors at particular frequency which is unique for evergy gas .spectrum which is left behind is called emission spectra. we can see some dark bands in it this happens because

When an atoms are passed throgh visible spectrum they absorbs energy, their electrons jump to higher energy levels. Then they jump back down again. Each jump corresponds to a particular wavelength of light.

There are many possible electron transitions for each atom. Each transition has a specific energy difference. This collection of transitions makes up an emission spectrum. These emission spectra are distinctive to each element

Thus we can use atomic spectra to identify the unknown gas .

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