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caesium has a work function3*10^-19j.the maximum energy electrons when it is illuminated by light of...

caesium has a work function3*10^-19j.the maximum energy electrons when it is illuminated by light of frequency 6.7*10^14hz.a_1.42*10^-19j B_3.00*10^-19.C_4.42*10^-19.D_7.42*10^-19 (h=6.6*10^-34)?
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