For a certain metal v is the five times ...

For a certain metal v is the five times of `v_(0)` and the maximum velocity of coming out photons is `8 xx 10^(6)m//s`. If `v = 2v_(0)`, then maximum velocity of photoelectrons will be

`4xx10^(6)ms^(-1)`

`6xx10^(6)ms^(-1)`

`8xx10^(6)ms^(-1)`

`1xx10^(6)ms^(-1)`

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