For a pendulum, or a child on a swing: Change the length of the pendulum or the swing-chains. For a guitar string: Change the tension (tune it), or the length (squeeze it into a fret). For an electronic oscillator: Change the piezo crystal, or change a capacitor or inductor for one of a different value.
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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.
Period = 1 / frequency
Given a frequency table,the first cumulative frequency is the same as the first frequency;the second cumulative frequency is the sum of the first cumulative frequency and the second [ordinary] frequency;the third cumulative frequency is the sum of the second cumulative frequency and the third [ordinary] frequency;and so on.An alternative definition is that the cumulative frequency for any value is the sum of all the frequencies less than or equal to that value.