Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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# Iron Emits Kα X-ray of Energy 6.4 Kev. Calculate the Times Taken by an Iron Kα Photon to Cross Through a Distance of 3 Km. - Physics

ConceptElectromagnetic Spectrum

#### Question

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

(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)

#### Solution

Given:
Energy of the X-ray, E = 6.4 keV
Distance travelled by the photon, d = 3 km = 3  xx  103 m
Time taken by the photon to cross the distance of 3 km is given by

t = "Distance"/"Speed" = (3 xx 10^3)/(3 xx 10^8)

t = 10^-5 "s" = 10 xx 10^-6 "s"

t = 10  mus

Both the Kα photon and X-ray will take the same time, that is, 10 μs , to cross the distance of 3 km.

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Solution Iron Emits Kα X-ray of Energy 6.4 Kev. Calculate the Times Taken by an Iron Kα Photon to Cross Through a Distance of 3 Km. Concept: Electromagnetic Spectrum.
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