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The return of excited atoms to their ground level by themselves is called ________ process. (1) stimulated (2) forced (3) pumped (4) spontaneous

Answer» <p style="text-align: justify;"><span style="color:#000000"><span style="font-family:Arial,Helvetica,sans-serif">The return of excited atoms to their ground level by themselves is called <strong>spontaneous </strong>process.</span></span></p>


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