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A free atom of iron emits Kalpha X-rays ...

A free atom of iron emits `K_alpha` X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of and iron atom `= 9.3 xx 10 ^(-26) kg`.

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The correct Answer is:
`K_("recoil")=((6.4xx10^(3)e)/(c ))xx(1)/(2xx(9.3xx10^(26)))J`
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