[" 37.A photossensitive metallic surface has work function,"hv_(0)" .If photons of energy "2hv_(0)" fall on this surtace,ine "],[" electrons come out with a maiximunn velocity of "4times10^(8)m/s" .When the photon entrgy is increased to "5hos" ,then "1],[" maximumum velocity of photolectrons will be "],[[" (1) "2times10^(6)m/s," (2) "2times10^(7)m/s," (3) "8times10^(5)m/s," (4) "8times10^(6)m/s]]