range of audio signal, audible range: 18--18000 Hz
range of music: 50-<18k
speech 100-5k
Visible light falls in the range of the EM spectrum between infrared (IR) and ultraviolet (UV). It has frequencies of about 4 × 1014 to 8 × 1014 cycles per second, or hertz (Hz) and wavelengths of about 740 nanometers (nm) or 2.9 × 10−5 inches, to 380 nm (1.5 × 10−5 inches).
https://prezi.com/ajvm8ptt9odt/the-visible-and-audible-spectrum/
Class
|
Abbreviation
|
Range
|
Applications
|
1. Extremely low frequency
|
ELF
|
30-300 Hz
|
110 VAC Power
|
2. Voice frequency
|
VF
|
300-30000 Hz
|
Telephone Data Modems
|
3. Very low frequency
|
VLF
|
3-30 KHz
|
Home Security
|
4. Low frequency
|
LF
|
30-300 KHz
|
Cicaria's Experiments
|
5. Medium freq.
|
MF
|
300-3000 KHZ
|
AM Radio
|
6. High frequency
|
HF
|
3-30 MHz
|
HF, CB Radio
|
7. Very high frequency
|
VHF
|
30-300 MHz
|
FM Radio Pecaesat Experiments, TV
|
8. Ultra high frequency
|
UHF
|
300-3000 MHz
|
TV
|
9. Super high frequency
|
SHF
|
3-300 GHz
|
Intel Sat
|
10. Extremely high frequency
|
EHF
|
30-300 GHz
|
None
|
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