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As we know, if we have a group of atoms at a moment N(t) in an exited state, it will exponentially decrease according to the relation:

N(t)=N(0) exp(-At)=N(0) exp(-t/(tau))

Where A is the Einsteins constant for the spontaneos emission,

In my book they defined tau in the relation I explained in PDF

Can Any one tell me WHERE DID HE BROUGHT THE SECOND RELATION FROM?

Thanks for reading

N(t)=N(0) exp(-At)=N(0) exp(-t/(tau))

Where A is the Einsteins constant for the spontaneos emission,

In my book they defined tau in the relation I explained in PDF

Can Any one tell me WHERE DID HE BROUGHT THE SECOND RELATION FROM?

Thanks for reading