Those two units are completely unrelated. Meter is a measure of length, Hertz is a unit of frequency (reciprocal of seconds).
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1,000 KHz = 1 MHz
It seems you are talking about radio waves. The wavelength (40 m) multiplied by the frequency (7 million / second) must equal the speed of light (300 million meters/second). It seems that in this example numbers, either the wavelength or the frequency, or both, are not expressed with a great accuracy. For example, if 40 meters is exact, the frequency would be close to 7.5 MHz.
400-470 mhz = -70
5 MHz = 1 second divided by 5.000.000 4.77 MHz = 1 second divided by 4.770.000
The period of 1 MHz is 1 microsecond. The waveform is irrelevant.