To be very technical, it depends on what the 'm' means in the question.
If the frequency in the question is 5 mHz = 5 mega-Hertz
then
mega = million, 5 mega = 5 million so 5 mega Hertz = 5 million Hertz.
5 mHz = 5 million cycles per second
But a small 'm' often means 'milli'. That's probably not what you meant,
but if it is, then
5 mHz = 5 milli Hertz = 0.005 Hz
That would mean 0.005 of a cycle per second,
or 200 seconds to finish one whole cycle.
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Another name for Hertz is cycles per second. So a Megahertz is 1 million cycles per second.
It means that something repeats so-and-so many times per second.
Yes, hertz is the unit of frequency and is equivalent to cycles per second. It measures the number of cycles or oscillations per second in a wave.
The measure of the number of cycles per second is called frequency. It is typically measured in hertz (Hz).
The unit of frequency measured in cycles per second is called Hertz (Hz).