FREQUENCY

Definition:

Frequency, also called wave frequency, is a measurement of the total number of vibrations or oscillations made within a certain amount of time.

Figure: Frequency waves

• Frequency is measured in the hertz unit.
• The Hz is abbreviated as hertz.

History:

Usually frequency is measured in the hertz unit, named in honor of the 19th-century German physicist Heinrich Rudolf Hertz. The hertz measurement, abbreviated Hz, is the number of waves that pass by per second. For example, an "A" note on a violin string vibrates at about 440 Hz (440 vibrations per second).

Figure: German physicist Heinrich Rudolf Hertz

Calculation:

Frequency can be calculated as

1). Frequency from wavelength:

                                f=V/𝛌

f        represents frequency,

V      represents the velocity of the wave, and

𝛌       represents the wavelength of the wave.

2). Frequency of electromagnetic waves in vaccum:

                                 f=C/𝛌

f        represents frequency,

C      represents the Velocity or speed of light, and

𝛌       represents the wavelength of the wave.

3). Frequency from time period:

                                  f=1/T

f        represents frequency,

T       represents the time period or amount of time required to complete a singal wave oscillation.

4). Frequency from Angular Frequency:

                                 f=ω/2π
f        represents the frequency of the wave
ω      represents the angular frequency
π       stands for pi, a mathematical constant.