6. What is the cyclotron frequency of a proton in a magnetic field of magnitude 5.20 T? (The mass of a proton is 1.67×10⁻²⁷ kg. The charge of a proton is 1.60×10⁻¹⁹ C)
(A) 1.98×10⁸ rad/s
(B) 2.98×10⁸ rad/s
(C) 3.98×10⁸ rad/s
(D) 4.98×10⁸ rad/s
(E) 5.98×10⁸ rad/s

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