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  • Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source

2.49    Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is 2.5\times 10^{15}, calculate the energy of the source.

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Given the duration of a radiation source = 2\ ns = 2\times10^{-9}s  and the number of pulse source is = 2.5\times10^{15}, then its frequency will be:

\nu = \frac{1}{2\times10^{-9}s} = 0.5\times10^{9}s^{-1}  

and the energy of the source for the given frequency will be:

E= Nh\nu = (2.5\times10^{15})(6.626\times10^{-34}Js)\times(0.5\times10^{9}s^{-1})

= 8.28\times10^{-10}J

 

Posted by

Divya Prakash Singh

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