$A$ charged particle oscillates about its mean equilibrium position with a frequency of $10^{9} \,Hz$. The frequency of electromagnetic waves produced by the oscillator is . . . . . . .
- A$10^{9} \,Hz$
- B$10^{-9} \,Hz$
- C$10^{18} \,Hz$
- D$10^{10} \,Hz$
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