The maximum velocity to which a proton can be accelerated in a cyclotron of $10\, MHz$ frequency and radius $50\, cm$ is
  • A$6.28\times10^8\, m/s$
  • B$3.14\times10^8\, m/s$
  • C$6.28\times10^7\, m/s$
  • D$3.14\times10^7\, m/s$
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