If `epsilon_(0)` be the permittivity of vacuum and r be the radius of orbit of H- atom in which electron is revolving, then velocity of electron is given by :
A
`v=(e)/(sqrt(4piepsilon_(0)rm)`
B
`v=exxsqrt(4piepsilon_(0)rm)`
C
`v=(4piepsilon_(0)rm)/(e)`
D
`v=(4piepsilon_(0)rm)/(e^(2))`
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