SI unit of Frequency | What is the SI unit of Frequency
- Hertz
Hello students we know that classical mechanics is the most essential branch of physics in which we study the microscopic particle and their movements. Formation of waves can be explained with the help of classical mechanics.
In the explanation of waves, terms related to waves viz. period of wave, frequency of wave and amplitude of wave should be understood so as to get the details of wave.
Frequency of the wave is defines as the number of vibrations/oscillations/rotations/revolutions performed by particle in given unit time. E.g. consider an example of simple pendulum which is oscillating to and from 120 times in one minute, then the frequency of pendulum will be,
120 oscillations per minute or 2 oscillations per second.
Sir Henrich Hertz, German physicist who experimentally proved the existence of electromagnetic waves. He performed experiment with induction coil and capacitor to create spark between gap of metal bracket proved the existence of electromagnetic waves.
Sir Henrich Hertz also proved experimentally the phenomena of photoelectric effect, in which the photosensitive metals like Zinc, manganese can emit the electrons when radiation of suitable frequency made incident on it, which are further collected and can be used to produce electric current termed as photoelectric current.
Taking this enormous contribution of Sir Henrich Hertz in the experimental physics, international system of units has renamed the unit of frequency as hertz.
Hence the SI unit of frequency, angular frequency and radioactivity is taken as ‘hertz’. Its symbol is ‘Hz’.
Per cycle, per rotation or per second is then equivalent to hertz.
Frequency is generally measured in multiples like kilohertz, megahertz etc.
Where, 1 KHz = 103 Hz,
1 MHz = 106 Hz
1 µHz = 10-6 Hz
Important Faq on SI unit of Frequency
Q.1) What is the relation between the period of oscillation and frequency of oscillation?
Answer: The frequency is defined as the number of oscillations completed by particle per unit time. Whereas as the period of oscillation is the time required to complete one vibration. Then,
Frequency = 1/period
Q.2) Write the table showing common prefixes used in representation of frequency?
Answer:
Range | Unit | Symbol | Range | Unit | Symbol |
10−1 Hz | decihertz | dHz | 101 Hz | decahertz | daHz |
10−2 Hz | centihertz | cHz | 102 Hz | hectohertz | hHz |
10−3 Hz | millihertz | mHz | 103 Hz | kilohertz | kHz |
10−6 Hz | microhertz | µHz | 106 Hz | megahertz | MHz |
10−9 Hz | nanohertz | nHz | 109 Hz | gigahertz | GHz |
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