- published: 02 Oct 2012
- views: 6090549
The hertz (symbol Hz) is the unit of frequency in the International System of Units (SI) and is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
One of the unit's most common uses is in the description of sine waves and musical tones, particularly those used in radio and other audio-related applications. It is also used to describe the speeds at which computers and other electronics are driven.
The hertz is equivalent to cycles per second. In defining the second, the International Committee for Weights and Measures declared that "the standard to be employed is the transition between the hyperfine levels F = 4, M = 0 and F = 3, M = 0 of the ground state 2S1/2 of the cesium 133 atom, unperturbed by external fields, and that the frequency of this transition is assigned the value 9 192 631 770 hertz" thereby effectively defining the hertz and the second simultaneously.
Sinusoidal wave going trough entire human audio spectrum, starting at 20Hz and ending at 20kHz. Note that the frequency increases exponentially, the idea was to increase the frequency by constant fraction of currently played frequency rather than by a constant value (which would result in clearly noticeable fast change at lower frequencies and nearly no change at higher frequencies). Enjoy. Note: This wave has the same volume level measured by acoustic pressure all the time, however human sound perception differs depending on frequency. For lower frequencies (below 1kHz) you might want to increase your volume, but don't forget to lower it later to avoid damage to your hearing. If you don't hear anything below 40-50Hz even at full volume your audio hardware is probably incapable of playi...
Watch in 1080p HD for best results! This is not to be taken seriously, but just something give you an image of how your hearing is. ===PLEASE READ DESCRIPTION=== Welcome, welcome, welcome to the home of the most comprehensive collection of beeps, rumbles, chirps and noise on teh Internets! Although this channel has very many sine wave frequencies available, if you can't find (on this channel) the desired frequency (or chirp or noise) you want, PM me and request that a frequency be posted. If you want the video to be of a different length (default is 30 seconds) or any other things, then include that in the personal message. A high quality 30 second clip (or what length that you specified) should be on this channel within one day! You do not have to be subscribed to this channel to req...
Mosquitos, el mejor repelente de sonido (sonido 17,4 kHz). For more great videos, please subscribe to this channel!
enjoy:)))
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Oh daddy, your brain's still flashin' like they did when you were young
Or did they come down crashin' seeing all the thing's you'd done
Spacin' out havin' fun
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