| Deutsche Version |
Here are audio waves transmitted through air. For radio waves and light waves" - scroll down ↓
Conversion: frequency f → wavelength λ and wavelength → frequency
c is the speed of sound waves (*or* can be the speed of light and radio waves)
Formulas and Equations: c = λ × f λ = c / f = c × T f = c / λ
| physical value | symbol | unit | formula |
| frequency | f = 1/T | Hz = 1/s | f = c / λ |
| wavelength | λ | m | λ = c / f |
| time period or cycle duration |
T = 1/f | s | T = λ / c |
| wave speed | c | m/s | c = λ × f |
Conversion of period to frequency and back
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• 2 − Radio waves and light waves in a vacuum •
Conversion: frequency f → wavelength λ and wavelength → frequency
c is the speed of light waves and the speed of radio waves in a vacuumIf instead of the speed of sound in air c = 343 m/s,
the speed of light c = 299792458 m/s is used, the following conversions apply.
The proposed speed of light c = 299792458 m/s or 983571056 ft/s can be changed here.
Wave frequency in Hz = 1/s and wavelength in nm = 10-9 m

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Radio-frequency and microwave radiation are both forms of energy called electromagnetic radiation.
Sunshine contains three other forms of electromagnetic radiation: ultraviolet rays, infrared (heat) waves,
and visible light waves. These electromagnetic waves spread in a vacuum at the speed of light ≈ 300,000 km/s. The velocity of propagation of electric signals via cables is nearly 2/3 of the speed of light, that means ≈ 200,000 km/s. The s means seconds. Sound is also shown at the spectrum chart, but it is no electromagnetic radiation. Sound pressure is the deviation from the local ambient pressure caused by a sound wave - mainly in air. The speed of sound is 343 m/s at 20°C in air. |
Spectrum of Electromagnetic Radiation
| Region | Wavelength Angstroms |
Wavelength centimeters |
Frequency Hz |
Energy eV |
| Radio | > 109 | > 10 | < 3×109 | < 10-5 |
| Microwave | 109 - 106 | 10 - 0.01 | 3×109 - 3×1012 | 10-5 - 0.01 |
| Infrared | 106 - 7000 | 0.01 - 7×10-5 | 3×1012 - 4.3×1014 | 0.01 - 2 |
| Visible | 7000 - 4000 | 7×10-5 - 4×10-5 | 4.3×1014 - 7.5×1014 | 2 - 3 |
| Ultraviolet | 4000 - 10 | 4×10-5 - 10-7 | 7.5×1014 - 3×1017 | 3 - 103 |
| X-Rays | 10 - 0.1 | 10-7 - 10-9 | 3×1017 - 3×1019 | 103 - 105 |
| Gamma Rays | < 0.1 | < 10-9 | > 3×1019 | > 105 |
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The notation "eV" stands for electron-volts, a common unit of energy measure in atomic physics. A graphical representation of the electromagnetic spectrum is shown in the figure below. |
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| Electromagnetic spectrum |
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Thus we see that visible light and gamma rays and microwaves are really the same things. They are all electromagnetic radiation; they just differ in their wavelengths. Sometimes the unit Ångström (angstrom) = 10-10 m = 0,1 nm is used for wavelength. |
Ohm's law as acoustic equivalent for plane progressive waves
Conversion of sound units (levels)
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