試題詳解

47. In a certain cyclotron a proton moves in a circle of radius 0.50 m. The magnitude of the magnetic field is 1.20 T. What is the oscillator frequency? (The mass of proton mp = 1.67×10^-27 kg)
(A) 1.83×10⁷ Hz
(B) 2.53×10⁷ Hz
(C) 3.62×10⁷ Hz
(D) 4.71×10⁷ Hz
(E) 5.83×10⁷ Hz