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 2ns and the number of photons emitted during the pulse source is , calculate the energy of the source.

Lifetimes of the molecules in the excited states are often measured by

1.	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 2ns and the number of photons emitted during the pulse source is , calculate the energy of the source.
Answer» rmine: The energy of pulsed radiation source Given Data: Duration= 2 ns = NUMBER of emitted photons = Formulas to be used: Energy = Where N = number of emitted photons during the pulse source h = Planck’s CONSTANT = = frequency of the radiation sourceFrequency of source = Calculation: Step 1: FIND frequency of source Step 2: Substituting N= h = In the energy formula, we get ,Energy =