A metal surface having v_(0) as threshold frequency is incident by light of frequency v, then select the correct statement

A metal surface having v_(0) as threshold frequency is incident by lig

1.	A metal surface having v_(0) as threshold frequency is incident by light of frequency v, then select the correct statement
Answer» `u = sqrt((2H.c(lambda_(0)-LAMBDA))/(m lambda_(0)lambda))` `u = sqrt((2h(v-v_(0)))/(m))` `u = sqrt((2h(lambda_(0)-lambda))/(m))` `u = sqrt((2(hv-W))/(m))` ANSWER :A