Wavelength frequency convert lambda Hz sound conversion acoustics acoustic audio radio speed of sound and radio waves wave length light vacuum equation formula speed of light - sengpielaudio Sengpiel Berlin
If instead of the speed of light, the speed of sound in air c = 343 m/s at 20°C
is used, the following conversions apply. |
| Audio sound frequency | Hz | | | Wavelength
in meter (m), feet (ft),
centimeter (cm) or inches (") |
m cm ft '' | | ↓ | | | | ↓ | | | | | | | | | | Wavelength in meters (m) | | | | Audio sound frequency | Hz | | centimeters (cm) | | | | | | | feet (ft) | | | | | | | inches ('') | | | | | |
| Speed of sound c = m / s ft / s at 20°C |
|
Fill out the gray box above and click on the calculation button of the respective column.
The proposed speed of sound c = 343 m/s or 1125.33 ft/s can be changed here.
The currently accepted value is c = 331.29 meters per second at 0 degrees Celsius; established in 1986. | |
Formulas and Equations: c = λ × f λ = c / f = c × T f = c / λ
Conversion of period to frequency and back The top open range of the frequency spectrum for sound waves 
| • 2 − Radio waves and light waves in a vacuum • Conversion: frequency f to wavelength λ and wavelength to frequency c is the speed of light waves and the speed of radio waves in a vacuum |
If instead of the speed of sound in air, the speed of light c = 299 792 458 m/s
is used, the following conversions apply. |
| Radio wave frequency | Hz | | | Wavelength
in meter (m), feet (ft),
centimeter (cm) or inches (") |
m cm ft " | | ↓ | | | | ↓ | | | | | | | | | | Wavelength in meters (m) | | | | Radio wave frequency | Hz | | centimeters (cm) | | | | | | | feet (ft) | | | | | | | inches (") | | | | | |
| Speed of radio waves or light c = m / s ft / s |
|
Fill out the gray box above and click on the calculation button of the respective column.
The proposed speed of light c = 299 792 458 m/s or 983 571 056 ft/s can be changed here. Formulas and Equations: c = λ × f λ = c / f = c × T f = c / λ Wave frequency in Hz = 1/s and wavelength in nm = 10−9 m
Radio wave 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
as electromagnetic radiation.
The velocity of propagation of electric signals via optical fibres is nearly 2/3 of the
speed of light, which means ≈ 200 000 km/s. In theory electrical signals move at the
speed of light. Cables only slow them down. The velocity propagation factor:
VOP = 1 ⁄ √ε, Epsilon is the dielectric constant, which is for polyethylene dielectrics
(PVC) nearly 1.4.
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 |
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. |
 | | Electromagnetic spectrum |
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. |
Approximate wavelength and frequency ranges of the colors Color
| Wavelength
nm | Frequency
THz | | red | 780 - 622 | 384 - 482 | | orange | 622 - 597 | 482 - 503 | | yellow | 597 - 577 | 503 - 520 | | green | 577 - 492 | 520 - 610 | | blue | 492 - 455 | 610 - 659 | | violet | 455 - 390 | 659 - 769 |
1 terahertz (THz) = 103 GHz = 106 MHz = 1012 Hz,
1 nm = 10-3 μm = 10-6 mm = 10-9 m.
White light is a mixture of the colors of the visible spectra. |
Sound waves and electromagnetic waves are different. Sound waves
need a medium to travel through, while the electromagnetic waves do
not. The properties of a sound wave depend on the properties of the
medium it travels through. |
Approximate speed of sound
in common materials | | Medium | Speed of sound
m/s ft/s | | Air, dry at 20 °C | 343 | 1 125 | | Hydrogen at 0 °C | 1 280 | 4 200 | | Water at 15 °C | 1 500 | 4 920 | | Lead | 2 160 | 7 090 | | Concrete | 3 100 | 10 200 | | Wood (soft - along the fibre) | 3 800 | 12 500 | | Glass | 5 500 | 18 500 | | Steel | 5 800 | 19 000 |
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