Orders of magnitude (frequency)

To help compare different orders of magnitude, the following list describes various frequencies, which is measured in Hertz.

Factor (Hz)	Multiple	Value	Item
10−18	1 attohertz (aHz)	~2.29 aHz	The Hubble Constant (once in 13.8 billion years)
10−15	1 femtohertz (fHz)
10−12	1 picohertz (pHz)
10−11	10 pHz	~31.71 pHz	Once per millennium
10−10	100 pHz	~317.1 pHz	Once per century
10−9	1 nanohertz (nHz)	~1 nHz	Once per generation
		~3.171 nHz	Once per decade
10−8	10nHz	11.6699016 nHz	Once in a blue moon[1]
		~31.71 nHz	Yearly (or Earth's orbital frequency)
10−7	100 nHz	~380.5 nHz	Monthly (or the Moon's orbital frequency)
		~413 nHz	Average menstrual cycle (28 days)
10−6	1 microhertz (µHz)	~1.653 µHz	Weekly
10−5	10 µHz	~11.57 µHz	Daily (or Earth's rotation frequency)
10−4	100 µHz	~277.8 µHz	Once per hour
10−3	1 millihertz (mHz)
10−2	1 centihertz (cHz)	~16.667 mHz	One rpm
10−1	1 decihertz (dHz)
100	1 Hertz	1 to 1.66 Hz	approximate frequency of an adult human's resting heart beat
		1 Hz	60 bpm, common tempos in music.
		2 Hz	120 bpm, common tempos in music.
101	1 decahertz (daHz)	10 Hz	cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm)
		12 Hz	acoustic — the lowest possible frequency that a human can hear[2]
		27.5 Hz	acoustic — the lowest musical note (A) playable on a normally-tuned standard piano
		50 Hz	electromagnetic — standard AC mains power (European AC, Tokyo AC)
		60 Hz	electromagnetic — standard AC mains power (American AC, Osaka AC)
102	1 hectohertz (hHz)	100 Hz	cyclic rate of a typical automobile engine at redline (equivalent to 6000 rpm)
		261.626 Hz	acoustic — the musical note middle C
		440 Hz	acoustic — concert pitch (A above middle C), used for tuning musical instruments
103	1 kilohertz (kHz)	4.186 kHz	acoustic — the highest musical note (C8) playable on a normally-tuned standard piano
		8 kHz	ISDN sampling rate
104	10 kHz	14 kHz	acoustic — the upper limit of human hearing
		17.4 kHz	acoustic — a frequency known as The Mosquito, which is generally only audible to those under the age of 24.
105	100 kHz	740 kHz	the clock speed of the world's first commercial microprocessor, the Intel 4004 (1971)
106	1 megahertz (MHz)	530 kHz to 1.710 MHz	electromagnetic — AM radio broadcasts
		1 MHz to 8 MHz	clock speeds of early home/personal computers (mid-1970s to mid-1980s)
107	10 MHz	13.56 MHz	electromagnetic — Near field communication
108	100 MHz	88 MHz to 108 MHz	electromagnetic — FM radio broadcasts
		902 to 928 MHz	electromagnetic — common cordless telephone frequency in the US
109	1 gigahertz (GHz)	1.42 GHz	electromagnetic — the hyperfine transition of hydrogen, also known as the hydrogen line or 21 cm line
		2.4 GHz	electromagnetic — microwave ovens, Wireless LANs and cordless phones (starting in 1998).
		3.8 GHz	highest clock speed Pentium 4 "Prescott" microprocessor (2005)
		5.8 GHz	electromagnetic — cordless phone frequency introduced in 2003
1010	10 GHz	3 GHz to 30 GHz	electromagnetic — super high frequency
1011	100 GHz	160.2 GHz	electromagnetic — peak of cosmic microwave background radiation
		845 GHz	fastest transistor (Dec. 2006)[1]
1012	1 terahertz THz
1013	10 THz	21 THz to 33 THz	electromagnetic — infrared light used in thermal imaging, for example for night vision
1014	100 THz	428 THz to 750 THz	electromagnetic — visible light, from red to violet
1015	1 petahertz PHz	2.47 PHz	electromagnetic — Lyman-alpha line
1016	10 PHz	30 PHz	electromagnetic — x-rays
1017	100 PHz
1018	1 exahertz EHz
1019	10 EHz
1020	100 EHz	300 EHz +	electromagnetic — gamma rays

• 262×10²⁴ Hz - The Frequency of Heat that Causes Uranium to Fission
• 1.85×10⁴³ Hz - Planck frequency, the inverse of the Planck time

See also

• Hertz

References

1. ^ Google Calculator Result for "once in a blue moon"
2. ^ 20 Hz is considered the normal low frequency limit of human hearing. When pure sine waves are reproduced under ideal conditions and at very high volume, a human listener will be able to identify tones as low as 12 Hz. Olson, Harry F. (1967). Music, Physics and Engineering. Dover Publications. p. 249. ISBN 0486217698. http://books.google.com/books?id=RUDTFBbb7jAC.