Find the wavelength of radiation having frequency $4 \times 10^{11} \ kHz$.
- A$7.5 \times 10^{-4} \ m$
- B$7.5 \times 10^{-7} \ m$
- C$7.5 \times 10^{-5} \ m$
- D$7.5 \times 10^{-6} \ m$
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