Question? Just ask us!
Free Encyclopedia of Building & Environmental Inspection, Testing, Diagnosis, Repair
InspectAPedia ® Home
ENVIRONMENTAL HAZARDS - INSPECT, TEST, REMEDY
AIR CLEANER PURIFIER TYPES
AIR CONDITIONING SYSTEM ODORS
AIR POLLUTANTS, COMMON INDOOR
AIR QUALITY IMPROVEMENT STRATEGIES
AIRBORNE PARTICLE ANALYSIS METHODS
ALLERGEN TESTS for BUILDINGS
ASBESTOS IDENTIFICATION IN BUILDINGS
BACKDRAFTING HEATING EQUIPMENT
BLACK MOLD, TOXIC & ALLERGENIC
BLEACHING MOLD, Advice about
BOOKSTORE - ENVIRONMENTAL
CADMIUM in the HOME
CARBON MONOXIDE - CO
CARPETING & INDOOR AIR QUALITY
CAT DANDER in BUILDINGS
CELL PHONE RADIATION
CHEMICAL CONTAMINANTS in WATER
COMBUSTION PRODUCTS & IAQ
DIRECTORY of MOLD / ENVIRONMENTAL EXPERTS
DUST SAMPLING PROCEDURE
EMERGENCY RESPONSE, IAQ, GAS, MOLD
EMF ELECTROMAGNETIC FIELDSRE
ENDOCRINE DISRUPTERS at BUILDINGS
FLOOD DAMAGE ASSESSMENT, SAFETY & CLEANUP
FLOOR TILE ASBESTOS IDENTIFICATION
FUNGICIDAL SPRAY & SEALANT USE
GAS EXPOSURE EFFECTS, TOXIC
HEATING OIL EXPOSURE HAZARDS, LIMITS
HOUSE DUST ANALYSIS
HOUSE DUST COMPONENTS
HUMIDITY CONTROL & TARGETS INDOORS
INDOOR AIR QUALITY IMPROVEMENT GUIDE
LAB PROCEDURES MICROSCOPE TECHNIQUES
LEAD POISONING HAZARDS GUIDE
LEGIONELLA LEGIONNAIRES' DISEASE
LIGHT, GUIDE to FORENSIC USE
METHANE GAS SOURCES
MILDEW in BUILDINGS ?
MOISTURE CONTROL in BUILDINGS
MOLD ACTION GUIDE - WHAT TO DO ABOUT MOLD
MOLD CONSULTANTS / INSPECTORS
MOLD DETECTION & INSPECTION GUIDE
MOLD / ENVIRONMENTAL EXPERT, HIRE ?
MOLD RELATED ILLNESS GUIDE
MSDS MATERIAL SAFETY DATA SHEETS
MVOCs & MOLDY MUSTY ODORS
NOISE / SOUND DIAGNOSIS & CURE
ODORS GASES SMELLS, DIAGNOSIS & CURE
OIL, HEATING, EXPOSURE HAZARDS, LIMITS
OIL HEAT ODORS & NOISES
OIL SPILL CLEANUP / PREVENTION
PET ALLERGENS / PET DANDER
PET STAINS & MARKS in BUILDINGS
PLASTIC ODORS-SCREENS, SIDING
PLUMBING SYSTEM ODORS
PVC - VINYL BUILDING PRODUCTS
RADON HAZARD TESTS & MITIGATION
SAFETY HAZARDS GUIDE
SAFETY HAZARDS & INSPECTIONS
METHANE GAS HAZARDS
SEPTIC SYSTEM ODORS
SEWAGE BACKUP TEST & CLEANUP
SEWER GAS ODORS
SMELL PATCH TEST to FIND ODOR SOURCE
STAIN DIAGNOSIS on BUILDING EXTERIORS
STAIN DIAGNOSIS on BUILDING INTERIORS
SULPHUR & SEWER GAS SMELL SOURCES
UFFI UREA FORMALDEHYDE FOAM INSULATION
URETHANE FOAM Deterioration, Outgassing
VINYL CHLORIDE HEALTH INFO
VOCs VOLATILE ORGANIC COMPOUNDS
WATER ODORS, CAUSE CURE
This article defines and compares frequency measurements expressed in Hertz, Kilohertz kHz, Megahertz MHz, Gigahertz GHz, and Terahertz THz .
Green links show where you are. © Copyright 2015 InspectApedia.com, All Rights Reserved.
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).
Our table (below) provides definitions of various frequencies or oscillation rates expressed in kilohertz, megahertz, gigahertz, or terahertz.
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).
Continue reading at ELECTROMAGNETIC FIELD EMF ELF DETECTION or select a topic from the More Reading links shown below.
Suggested citation for this web page
Green link shows where you are in this article series.
Frequently Asked Questions (FAQs) about the definitions of Hertz & various frequency measurements
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]
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
10 to the 1th is 10
10 to the 2d power is 10 x 10 = 100 (1 followed by two zeroes) making you correct
or 1 followed by fifteen zeroes - you are quite correct and we have amended our article text to be more accurate.
Thank you. Daniel Friedman
Questions & answers or comments about various hertz definitions. .
Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.
Search the InspectApedia website
HTML Comment Box is loading comments...
Technical Reviewers & References