The photoelectric threshold for a metal is 3000*10^-10m. Find the kinetic energy of an electron ejected from it by radia

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The photoelectric threshold for a metal is 3000*10^-10m. Find the kinetic energy of an electron ejected from it by radia

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The photoelectric threshold for a metal is 3000*10^-10m. Findthe kinetic energy of an electron ejected from it by radiation ofwavelength 1200*10^-10m.
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