What is the frequency for a beam of electrons orbiting in a field of 4.62 x 10^-3 T? Let the mass of an electrons m = 9.31 x 10^-31 kg, and the charge on an electron q = - 1.60 x 10^-19 C.
A. 129 MHz
B. 439 MHz
C. 223 MHz
D. 811 MHz
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