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An electron is moving in a cyclotron at a speed of \( 3.2 \times 10^{7} \mathrm{~ms}^{-1} \) in a magnetic field of \( 5 \times 10^{-4} \mathrm{~T} \) perpendicular to it. What is the frequency of this electron? \( \left(q=1.6 \times 10^{-19} \mathrm{C}, m_{e}=9.1 \times 10^{-31} \mathrm{~kg}\right) \)
(a) \( 1.4 \times 10^{5} \mathrm{~Hz} \)
(b) \( 1.4 \times 10^{7} \mathrm{~Hz} \)
- (c) \( 1.4 \times 10^{6} \mathrm{~Hz} \)
(d) \( 1.4 \times 10^{9} \mathrm{~Hz} \)
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