L. fetimes of the molecules in the excited state are often measured by using pulsed radiation soruce 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 xx 10^(15), calculate the energy of the source.

L. fetimes of the molecules in the excited state are often measured by

1.	L. fetimes of the molecules in the excited state are often measured by using pulsed radiation soruce 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 xx 10^(15), calculate the energy of the source.
Answer» SOLUTION :FREQUENCY `= (1)/(2 xx 10^(-9) s) = 0.5 xx 10^(9) s^(-1)` Energy `= N HV = (2.5 xx 10^(5)) (6.626 xx 10^(-34) Js) (0.5 xx 10^(9) s^(-1)) = 8.28 xx 10^(-10) J`