Iron emits Kα X-ray of energy 6.4 keV and calcium emits Kα X-ray of energy 3.69 keV. Calculate the times taken by an iron Kα photon and a calcium Kα photon to cross through a distance of 3 km.

Given: Iron ray energy=6.4 Kev


Calcium ray of energy= 3.69 Kev


We have to calculate the time taken each of those rays to travel a distance of 3 Km





Both the Ka photon and X-ray photon will take the same time that is 10μs


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