Question #e0081
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By Einstein's equation for photoelectric effect we know
#hnu=hnu_o +1/2mv^2#
Where
#h->"Planck's constant"=6.626xx10^-34Js#
#nu->"frequency of incident radiation"=2.00xx10^15s^-1#
#nu_o->"thresold frequency of incident radiation"=1.67xx10^15s^-1#
#m->"mass of electron"=?#
#v->"velocity of ejected electron"=6.84xx10^5m/s#
Now
#hnu=hnu_o +1/2mv^2#
#=>1/2mv^2=h(nu-nu_@)#
#=>m=(2h(nu-nu_@))/v^2#
#=>m=(2*6.626*10^"-34"(2-1.67)*10^15)/(6.84^2*10^10)#
#=>m=(2*6.626*0.33*10^-31)/6.84^2#
#=>m=9.34xx10^-31 kg#
