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Maximum velocity of photoelectron emitte...

Maximum velocity of photoelectron emitted is `4.8 m//s`. If `e//m` ratio of electron is `1.76 xx 10^11 (kg^-1)` then stopping potential is given by

A

`5 xx 10^-10 J`

B

`3 xx 10^-7 J`

C

`7 xx 10^-11 J`

D

`2.5 xx 10^2 J`.

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