The work function of cesium metal is 3.43x10^-19J. Calculate the kinetic energy of the ejected electron

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The work function of cesium metal is 3.43x10^-19J. Calculate the kinetic energy of the ejected electron

[From: ] [author: ] [Date: 11-12-14] [Hit: ]

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if light of frequency 1x10^15 s^-1 is used for irradiating the metal. No idea how to do this!

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[ photon energy ] = [ metal work function energy ] + [ KE of electron ejected ]
[ h * f ] = [ 3.43E-19 ] + [ KE ]
[ 6.626 069E-34 * 1E+15 ] = [ 3.43E-19 ] + [ KE ]
KE = 3.196E-19 J <=======ans

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