Correct Answer - B
By Using `E = W_(0) + (1)/(2) mv_(max)^(2)` , where
`E = (12375)/(4558) = 2.71 eV`
`rArr 2.71 ev = 2.5 eV + (1)/(2) eV + (1)/(2) xx 9.1 xx 10^(-31) xx v_(max)^(2) `
`rArr 0.21 xx 1.6 xx 10^(-19) = (1)/(2) xx 9.1 xx 10^(-31) xx v_(max)^(2)`
`rArr v_(max) = 2.65 xx 10^(5) m//s`