I presume you mean "microwaves".
"Micro" is just a prefix indicating a measurement to be 1,000,000 times the value given. For instance; 5,000,000 micro Amps is 5 Amps.
For microwaves though you should really be able to search for this answer... It's not exactly obscure. Here is is anyway:
300MHz - 300GHz
Which means 300,000,000 cycles per second to 300,000,000,000 cycles per second.
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Period = (1/frequency) = 1/104 = 10-4 = 0.0001 second = 0.1 millisec = 100 micro sec.
The prefix "micro" means "a millionths of".
The ration of a frequency to its total frequency is called relative frequency.
frequency meter is used to measure the frequency of unknown frequency signal.
The frequency in a frequency table is the number of occurrences within each class width. The total frequency is the sum of all frequency's within all the classes.