[" (1) "[" (1) "6times10^(5)ms^(-1),(2)~~0.6times10^(6)m^(-1)],[69." An electron of mass "m" with an initial velocity "vec V=V_(0)hat imath(V_(0)>0)" electric filed "vec E=-E_(0)hat imath(E_(0)=],[" 69.An electron of mass "m" with an indloity "vec V=V_(0)hat imath(V_(0)>0)" electric filed "vec E=-E_(0)hat imath" T "2018]],[" constant ">0" at to ",(2)lambda_(0)t],[(1)lambda_(0)(1+(rho E_(0))/(mv_(0))t),(2)lambda_(0)t],[70," When the light of frequency "2v_(0)(" where "v_(0)" is threshold firequency),is incident on a metal plate,the maximum "]]