Multiple choice

A molecular electronic excited state has a life time of 10–9 s, the uncertainty in measuring the frequency (Hz) of the electronic transition is approximately

  1. $\frac{h}{4\pi} \times 10^ 9 $
  2. $\frac{h}{4\pi} \times 10^ {-9} $
  3. $\frac{1}{4\pi} \times 10^ {-9} $
  4. $\frac{1}{4\pi} \times 10^ 9 $
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