Q15. the lifetime of an atomic state is in the emission spectrum of this state is of the order of (a) 10 ev i nanosecond. the natural line width of the spectral

Q15. The lifetime of an atomic state is in the emission spectrum of this state is of the order of (a) 10 eV I nanosecond. The natural line width of the spectral line (b) 10 eV c)10 eV (d) 10 ev