π Waves, Frequency, Wavelength and Hertz β Explained Simply
π Waves, Frequency, Wavelength and Hertz β Explained Simply
Waves are everywhere around us. Sound, radio signals, light, Wi-Fi, and water waves are examples of waves.
Three things are especially important:
Speed Frequency Wavelength
Their relationship is:
β‘ v = f Γ Ξ»
Speed = Frequency Γ Wavelength
π€ What do they mean?
* v = Speed β How fast the wave moves.
* f = Frequency β How many times the wave repeats every second.
* Ξ» = Wavelength β The distance between one wave peak and the next.
βΈ»
π What is Hz?
Hz means Hertz.
It tells us how many times something repeats in one second.
* 1 Hz = 1 time per second
* 10 Hz = 10 times per second
* 100 Hz = 100 times per second
* 1,000 Hz = 1 kHz
So, Hz = cycles per second.
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π£οΈ Example: Human Voice
When we speak or hum, our vocal cords create vibrations in the air.
Suppose a sound has a frequency of 100 Hz.
If sound travels through air at about 343 m/s:
Wavelength = Speed Γ· Frequency
Ξ» = 343 Γ· 100
Ξ» β 3.43 meters
This does not mean a 3.43-meter object comes out of your mouth. π
It means the distance between matching points of that sound wave is about 3.43 meters.
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π Frequency and Wavelength
When wave speed stays the same:
Higher Frequency β Shorter Wavelength
Lower Frequency β Longer Wavelength
For example:
100 Hz β 3.43 m
500 Hz β 0.686 m
So, increasing frequency makes the wavelength shorter.
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π Easy Water-Wave Example
Imagine waves in water:
γ°οΈ γ°οΈ γ°οΈ γ°οΈ
If:
Frequency = 5 Hz
and:
Wavelength = 2 m
Then:
v = 5 Γ 2 = 10 m/s
So the wave moves at 10 meters per second.
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π‘ What About Radio and Wi-Fi?
Radio waves and Wi-Fi signals are electromagnetic waves.
They also have:
Frequency Wavelength Speed
For electromagnetic waves in vacuum:
Speed β 300,000,000 m/s
For example, a 100 MHz radio wave has a wavelength of about 3 meters.
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π¨βπ¬ Why Is It Called Hertz?
The unit Hertz (Hz) was named after German physicist Heinrich Hertz.
He made important experiments showing that electromagnetic waves exist and can be generated and detected.
That is why frequency is measured in Hertz (Hz).
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π§ Remember It Like This
Frequency = How many times?
Wavelength = How far apart?
Speed = How fast?
And the main formula is:
β‘ Speed = Frequency Γ Wavelength
In short:
Hz β Frequency
Ξ» β Wavelength
v β Speed
These three simple ideas help us understand sound, radio, Wi-Fi, mobile signals, light, radar, and many other technologies.
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