If the maximum value of accelerating potential provided by a radio frequency oscillator is \( 12 \, \text{kV} \). The number of revolution made by a proton in a cyclotron to achieve one sixth of the speed of light is _____.
[ \( m_p = 1.67 \times 10^{-27} \, \text{kg} \), \( e = 1.6 \times 10^{-19} \, \text{C} \), Speed of light \( = 3 \times 10^{8} \, \text{m/s} \) ] .
