A cyclotron's oscillator frequency is 10 MHz. What should be the operating magnetic field for accelerating protons? If the radius of its dees is 60 cm, what is the kinetic energy (in MeV) of the proton beam produced by the accelerator? (e=1.60×10−19 C,mp=1.67×10−27 kg,1 MeV=1.6×10−13 J)