Which equation shows right ratio between the frequency (f) and the wavelength (Lambda) of

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Which equation shows right ratio between the frequency (f) and the wavelength (Lambda) of radio waves?

A.f=Lambda/C

B.f=C x Lambda

C.f=C/Lambda

D.f=C x 6.28 x Lambda

请帮忙给出正确答案和分析,谢谢!

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