In a He-Ne laser,the metastable state exists | vedclass

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(B) In a $He-Ne$ laser,the $He$ atoms are excited by an electric discharge to higher energy levels. These excited $He$ atoms collide with $Ne$ atoms a

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$Ne$

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(B) In a $He-Ne$ laser,the $He$ atoms are excited by an electric discharge to higher energy levels. These excited $He$ atoms collide with $Ne$ atoms and transfer their energy to them. The $Ne$ atoms are then excited to a metastable state,which is a state where the atoms remain for a relatively long time before undergoing stimulated emission. Therefore,the metastable state exists in the $Ne$ atoms.

In a $He-Ne$ laser,the metastable state exists in:

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