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Photograph of an electric meter too close to a bed and sleeping area - high EMF will be measured if quite close to electrical meters Hertz, Kilohertz, Megahertz, Gigahertz, Terahertz FAQs
Q&A about frequency measurements

  • POST a QUESTION or COMMENT about definitions of frequency measurements: hertz, kilohertz, megahertz, gigahertz, terahertz and cycle counts

Definitions of Hertz, Kilohertz, etc.

This article defines and compares frequency measurements expressed in Hertz, Kilohertz kHz, Megahertz MHz, Gigahertz GHz, and Terahertz THz .

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Q&A on Definitions of Kilohertz, Megahertz, Gigahertz, Terahertz

Power substation Pleasant Valley NY (C) Daniel FriedmanThese questions & answers about the definitions of the various measures of frequency were posted originally

at DEFINITIONS of HERTZ, KHz MHz GHz THz - we hope you'll review the definitions given there.

On 2018-09-26 by (mod) - A lightsecond is about 300000000 meters.

Thank you for clarifying. I appreciate it. Indeed one light second 300000000 m is almost exactly 1 hz.

That's a very long wavelength and that's a very low frequency.

On 2018-09-25 y Larry

I was speaking of wavelenth.

A lightsecond is about 300000000 meters.

On 2018-09-24 by (mod) -

Larry

Just to clear up what I think maybe a misunderstanding about Hertz,

1 hertz frequency means one cycle per second. That's extremely slow, not extremely fast as you were suggesting.

On 2018-09-24 by Larry

As it is 1 lightsecond long I wondered if ot is possable to produce it in the first place.

On 2018-09-24 by (mod) - electromagnetic waves at all of these frequencies can be detected.

Using the right equipment electromagnetic waves at all of these frequencies can be detected.

On 2018-09-23 by Larry

Can we detect radiowaves at less than 1 hz?

On 2018-06-08 by (mod) - what is the speed of light compared with the speed of sound?

Right, Andrew.

Light travels at about 983,571,056 feet per second or about 299 792 458 m / s or about 186,282 miles per second.

Sound travels at about 1125 feet per second, or about 343 m / s in dry air at 20 degC.

When a lightning bolt flashes within visual range, the light reaches you 874,285 times faster than the sound waves.

It's fine to consider light in the electromagnetic spectrum. Light is perceived by photos arriving at the retina of the eye and being transformed into signals sent to the visual cortex area of the brain.

Sound is perceived by the movement of air (not photos or light energy), impacting on the ear drum and then being converted to signals sent to the auditory cortex is the part of the temporal lobe of the brain.

Light can and does travel through a vacuum as well as through air or the atmosphere.

In a vacuum (the complete absence of air, for example) no sound would be transmitted.

In sum, when comparing light and sound, the transmission media are different, the mechanism of perception is different, and their speeds are vastly different.

On 2018-06-08 by Andrew - why we see lightning before we hear the thunder

Please answer the question I searched for above:

We see lightning before we hear thunder. I understood this is because light and sound, both electromagnetic waves, don't travel at the same speed.

On 2017-09-25 by (mod) - Herz measures frequency in cycles per second.

Herz measures frequency in cycles per second.

Decibels, as you say, measure the intensity of sound (on a logarithmic scale, meaning that if you double the decibel reading you are multiplying its intensity by a factor of 10).

There is a relationship between hertz and sound frequency - a human can hear at best sound waves in the frequency range of about 20 hz to 20khz or 20 thousand cycles per second. Some animals can hear higher frequencies than we do and others (whales) lower frequencies.

The Hertz measurement in cycles per second is not, however restricted to sound waves. It can measure any frequency of anything. If I wave my hand out the window ten times a second, that event is occurring at 10 herz.

On 2017-09-25 by OBI DANIEL

Greetings. I need practical approach to this. If decibel measure the volume/intensity of sound what does hertz measure? I know it's oscillation per second but in an an unscientific language, what does it measure? Is it distance covered or type of sound or what? Use examples if possible.
Hope to hear from you guys soon.

On 2017-03-27 by (mod) - definition of 1-hertz

Roshan

1 Hertz means that whatever you're measuring, it cycles ONE time per second.

On 2017-03-27 by Hemmanuel

Thanks for ur knowledge, but i agree with what annon said,he is right!

On 2016-10-23 by Roshan Kumar

What is the formula of 1 hertz

On 2016-03-30 by (mod) -

Mihai,

Yes there is research discussing signals (and antannae) in the pentahertz (perhaps you meant petahertz) frequency range as well as exahertz. See

Sharma, Krishna Hari, Abhishek Kandwal, and Sunil Kumar Khah. "A novel nano-antenna design for pentahertz frequency." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013, vol. 1536, no. 1, pp. 1151-1152. AIP Publishing, 2013.

Ismail, M. K. H., and M. Esa. "Preliminary design of rectangular nano-antenna at PHz." In Applied Electromagnetics (APACE), 2010 IEEE Asia-Pacific Conference on, pp. 1-4. IEEE, 2010.

Haynes, Kate. "Magneto-optical spectroscopic studies of multi-heme enzymes." PhD diss., University of East Anglia, 2013.

Petahertz

Süßmann, Frederik, and Matthias F. Kling. "Attosecond measurement of petahertz plasmonic near-fields." In SPIE NanoScience+ Engineering, pp. 80961C-80961C. International Society for Optics and Photonics, 2011.

Weiner, J., and Frederico D. Nunes. "High-frequency response of subwavelength-structured metals in the petahertz domain." Optics express 16, no. 26 (2008): 21256-21270.

On 2016-03-30 by (mod) - Herz measures frequency in cycles per second.

Thanks Kandi.

I have moved the milligauss / hertz discussion into the bottom of the article DEFINITIONS of HERTZ, KHz MHz GHz THz so that I could add some remarks.

Don't hesitate to ask if you find any InspectApedia.com article unclear - working together makes us smarter.

Daniel

On 2016-03-29 2 by Kandi

Thank you ever so much for your explanation about the difference between MilliGauss and Hertz.

On 2015-06-04 by Mihai

are pentaherz frequencies achievable?


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