Current Attempt in Progress

A cyclotron with dee radius $50\mathrm{.}3$ cm is operated at an oscillator frequency of $12\mathrm{.}4$ MHz to accelerate protons. $($a$)$ What magnitude B of magnetic field is required to achieve resonance? $($b$)$ At that field magnitude, what is the kinetic energy of a proton emerging from the cyclotron? Suppose, instead, that B$=1\mathrm{.}81$ T$.($c$)$ What oscillator frequency is required to achieve resonance now? $($d$)$ At that frequency, what is the kinetic energy of an emerging proton?

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