Which of the following is a unit of measure that represents frequency and is expressed as the number of cycles per second?

Definitions of Hertz, Kilohertz, Megahertz, Gigahertz, Terahertzfrequency measures

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Definitions of Hertz, Kilohertz, Megahertz, Gigahertz, Terahertzfrequency measures
Reader Question: how many zeros in a PetaHertz?
Reader Question: what's the relationship between Hertz and Milligauss?
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Which unit of measure represents frequency and is expressed as the number of cycles per second group of answer choices Joule Weber Gauss Hertz?
Which unit of measure represents frequency and is expressed as the number of cycles per second quizlet?
Which term accurately describes Layer 3 of the Open Systems Interconnection model?
Which institute is a collection of engineers who work together to create standards used throughout the networking industry?

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Definitions of Hertz, Kilohertz, etc.

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

We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.

Relation of wavelength to frequency & speed: notice that the shorter the wavelength the higher the frequency. That's why in our table above as the wavelengths get smaller (notice those negative exponents?) the electromagnetic frequency numbers get larger.

More technically, wavelength is inversely proportional to wave frequency.

Do not confuse wavelength and frequency of an electromagnetic wave with its speed.

All electromagnetic waves move at or close to the speed of light (and do move at the speed of light if measured in a vacuum).

The speed of an electromagnetic wave, expressed in meters per second is equal to wavelength (in meters) x frequency (in oscillations per second or Hertz, abbreviated as Hz).

Hertz - Hz is defined as the number of cycles per second of any oscillating or repeating phenomenon, but usually used to define electrical signals, or electrical field frequencies such as those of electromagnetic fields, radio signals, or computer processing clock cycles.
The term Hertz as used in frequency measurement was named for German physicist Heinrich Hertz (1857-1894), who studied electromagnetism, clarified Maxwell's electromagnetic theory of light, and demonstrated the existence of electromagnetic waves.
The term Hertz was established by the International Electrotechnical Commission in 1930.
Kilohertz - kHz is defined as thousands of cycles per second.
Megahertz - MHz is defined as millions of cycles per second - 1000 x more than kilo. See our table below.
Gigahertz - GHz is defined as billions of cycles per second - 1000 x more than mega, or 1,000,000,000 cycles per second - Microwave towers, UHF and EHF transmission - operate in the 1GHz to 100GHz range.
Terahertz - THz is defined as trillions of cycles per second- Wavelengths at frequencies still higher than EHF - GHz are referred to as Terahertz radiation, but are more familiarly understood as infrared light.
Still higher frequencies become light visible to the human eye. One THz is a very high frequency unit of electromagnetic (EM) wave frequency equal to one trillion hertz (10-to-the-12th power Hz)

Our table (below) provides definitions of various frequencies or oscillation rates expressed in kilohertz, megahertz, gigahertz, or terahertz.

Frequency Definitions	Frequency in words	Frequency in Exponent Form
Definition of Hertz Hz	One Hertz - one cycle per second	10-1
Definition of Decahertz daHz	Tens of cycles per second	101
Definition of Hectohertz hHz	Hundreds of cycles per second	102 Not in common use
Definition of Kilohertz KHz	One kilohertz - one thousand cycles per second = 1,000	103
Definition of Megahertz MHz	One megahertz - one million cycles per second = 1,000,000	106
Definition of Gigahertz GHz	One gigahertz - one billion cycles per second = 1,000,000,000	109 to 1012 (range)
Definition of Terahertz THz	One terahertz - one trillion of cycles per second = 1,000,000,000,000	1012 to 1015 (range)

The additional Hertz incredibly-high frequencies listed below are not likely to be found in use describing electromagnetic radiation such as those discussed in these articles - these are not in common use, but may be used to describe quantum-mechanical wave functions.

Definition of Petahertz PHz	One petahertz - one followed by 15 zeros, or more formally, One One Petahertz PHZ = 1 x 1015 [cycles per second if we are discussing frequency]	1015
Definition of Exahertz EHz	One exahertz - one followed by 18 zeros, or One EHZ = 1 x 1018	1018
Definition of Zetahertz ZHz	One zetahertz -one followed by 21 zeros, or One ZHz = 1 x 1021	1021
Definition of Yotahertz YHz	One yotahertz - one followed by 24 zeros, or One YHz = 1 x 1024	1024

Separately at TABLE of EMR FREQUENCIES we provide a separate listing of the frequency in Hertz of various sources of electromagnetic radiation, ranging from ULF - ultra low frequency sources - through UHF - ultra high frequency electromagnetic radiation sources.

Because the possible effects of electromagnetic fields on humans, other animals, and even materials varies significantly by frequency (and wavelength, distance, and other factors).

Reader Question: how many zeros in a PetaHertz?

I read in [the article above]

“One petahertz = ten followed by 15 zeros”

I Believe it should be :

One petahertz = one followed by 15 zeros

The same mistake is repeated for the definitions of : Exahertz Zetahertz Yotahertz. - Y. [Annon]

Reply:

Thank you for the question on clarifying how to write the value of various high-frequency measurements such as Petahertz, Exahertz, etc.

The correct formula for one PHz is 1 x 10 to the 15th power

Since 1 x anything is identical to that "anything",

10 to the 1th is 10

10 to the 2d power is 10 x 10 = 100 (1 followed by two zeroes) making you correct

1 x 10 to the 15th is exactly equal to 10 to the 15th which you could write as

1,000,000,000,000,000

or 1 followed by fifteen zeroes - you are quite correct and we have amended our article text to be more accurate.

Reader Question: what's the relationship between Hertz and Milligauss?

Albert in the article list below

see EMF ELECTROMAGNETIC FIELDS & HUMAN EXPOSURE

Electromagnetic field strength (measured in gauss) falls off as the square of the distance. There is no one fixed number since you need to know the field strength and distance.

About your earlier question, Milligauss relates to Hertz about as "inches" relates to "pounds" - they are different measurement scales.

Milligauss is a measurement of the strength of an electromagnetic field. Gauss is a unit measurement of electromagnetic strength. The use of the word "milli" means we are expressing the field strength in thousandths of one gauss.
A technical definition of gauss from dictionary.com is pretty specific, and I'll give it below. But in a practical sense, if we have standards of exposure to an electromagnetic field that are expressed in gauss, typically we just want to compare our exposure measurement (or estimate) with the number in the standard.
As long as we keep the units of measurement the same, gauss, we can make comparisons.
Hertz measures cycles per second - one Hertz is one cycle per second.
Unlike gauss that is a measurement unit for the strenght of a specific thing (an electromagnetic field), hertz is a generic frequency measurement.

We could be measuring the frequency with which we hear our alarm clock beeping (maybe one Hertz or one beep per second) or we could be measuring the frequency with which we see a chicken cross the road at my sister's house in Georgia: about 0.0003 Hertz - or about one chicken per hour.

They don't cross very often and some of them who try it get run over.

We could say that Linda's road-crossing-chicken-rate was observed to be 0.0003 Hertz. I calculated that as 1 chicken crossing observed in one hour, or 1/3600 seconds = 0.0002777

Formal definition of gauss

gauss: the centimeter-gram-second unit of magnetic induction, equal to the magnetic induction of a magnetic field in which one abcoulomb of charge, moving with a component of velocity perpendicular to the field and equal to one centimeter per second, is acted on by a force of one dyne;

1 maxwell per square centimeter or 10− 4weber per square meter. Symbol: G. - dictionary.com retrieved 2016/03/29

Formal definition of hertz

hertz, the standard unit of frequency in the International System of Units (SI), equal to one cycle per second. Abbreviation: Hz. - op. cit.

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Technical Reviewers & References

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Which unit of measure represents frequency and is expressed as the number of cycles per second group of answer choices Joule Weber Gauss Hertz?

The SI unit for frequency is the hertz (Hz). One hertz is the same as one cycle per second.

Which unit of measure represents frequency and is expressed as the number of cycles per second quizlet?

Which unit of measure represents frequency and is expressed as the number of cycles per second? Explanation: Hertz represents frequency and is expressed as the number of cycles per second.

Which term accurately describes Layer 3 of the Open Systems Interconnection model?

Router. A router is a hardware routing device. A router works at layer 3 of the OSI model—the Network layer—and so can communicate between various networks. Layer 3 is where the IP protocol examines the source and destination of packets between IP addresses.

Which institute is a collection of engineers who work together to create standards used throughout the networking industry?

The family of standards is developed and maintained by the IEEE 802 LAN/MAN Standards Committee, also called the LMSC. IEEE stands for Institute of Electrical and Electronics Engineers. The set of standards started in 1979 with a "local network for computer interconnection" standard, which was approved a year later.