jump to navigation

What is a Fundamental Frequency? September 10, 2006

Posted by healthyself in 5 Hz, 5-10 Hz, Blogroll, Cell phone safety, Definitions, Frequencies, Harmonics, Overtones, Resonance, Sound, Vibration, Waves.
add a comment

Harmonics, Resonance, and Interference

“Every object has a unique natural frequency of vibration.”

“A periodic force occurring at the same frequency as the natural frequency of vibration of an object may cause the object to vibrate. This is called mechanical resonance.”…

“The force and the object being affected must come into physical contact for mechanical resonance to occur….

“…The lowest frequency which will produce a standing wave pattern in a one dimensional medium is called the fundamental frequency.”

“Higher resonant frequencies also produce standing wave patterns. The first overtone of a string fixed at both ends has a nodal point in the centre of the medium, as well as at either end. It has twice the frequency of the fundamental frequency.”

“Multiples of the fundamental frequency are also called harmonics. The fundamental frequency is the first harmonic, the second harmonic corresponds to the first overtone,the third harmonic is the second overtone, and so on….”

..”Two sound sources vibrating at slightly different frequencies (roughly 5 to 10 Hz) produce a series of beats.”

“What is heard is a sound whose frequency is apparently the average of the two frequencies
(f1 + f2) /2which rises and falls in intensity at a frequency equal to the beat frequency absolute value of f1 - f2

http://www.sasked.gov.sk.ca/docs/physics/u5c42phy.html

Advertisements

Why Would WHO Do This If There Weren’t a Recognized Problem? (Even if they won’t admit it yet) September 5, 2006

Posted by healthyself in .000021 W/Kg, .0004 W/Kg, .001 W/Kg, .0021 W/KG, .005 W/Kg, .0317 W/Kg, .05 W/Kg, .13 W/Kg, .14 W/Kg, .2 mHz, .26 W/Kg, .4 W/Kg, .58 W.Kg, .6 W/Kg, .75 W/Kg, 1.2 W/Kg, 1.6 W/kg, 100 kHz-94GHz, 10000 Hz, 10mW, 12000 volts, 138 kv, 14 mG, 16 Hz, 17.6 Hz, 2 W/kg, 2.4 GHz, 2.4 mW/Kg, 20 Hz, 200 gauss, 20000 Hz, 200000 Hz, 35 mG, 3W/Kg, 4 mG, 45, 45 Hz, 5 GHz, 5 Hz, 50 Hz, 500 Volts, 60 Hz Magnetic Fields, 85, 8W/kg, 900 mHz, Animal Research, Cell phone safety, Children's health, Chromosomal damage, Communication, Community, Death, Decision Making, Digital, Electromagnetic pollution, Electromagnetic waves, Electrosensitivity, Electrosmog, ELF, Emergency Medicine, EMF Research, EMF's, Employees, EMR, Environment, Epidemiologists, Funding, Games and Gaming, genes, GHz, Government's role, grams of tissue, Grants, Hand Portables, Health related, High Frequencies, HOuseholds, Hz, Immune system, Legal Issues, Long Term Health Risks, Low Frequencies, Medical Research, Men's Health, MHz, Microwave exposure, Military, miscarriages, mobile telephones, Noise, Parenting, Public Policy, Pulsed Radiation, radiation, Reaction Time, Research, Risk Factor, Risk of Disease, Safe Levels, Safety, SAR, School administrators, Teenagers, Tweenies, University, W/Kg, watts, Who is Affected?, Women's Health, Workplace.
4 comments

Electromagnetic fields Photos permitted by the National Radiological Protection Board, UK

“Electromagnetic fields of all frequencies represent one of the most common and fastest growing environmental influences, about which anxiety and speculation are spreading. All populations are now exposed to varying degrees of EMF, and the levels will continue to increase as technology advances.”

“As part of its Charter to protect public health and in response to public concern, the World Health Organization (WHO) established the International EMF Project in 1996 to assess the scientific evidence of possible health effects of EMF in the frequency range from 0 to 300 GHz.”
“The EMF Project is open to broad participation.”

“The EMF Project is open to any WHO Member State government, i.e. department of health, or representatives of other national institutions concerned with radiation protection. The project is fully funded by participating countries and agencies.”

You Better Not Wait for Science to Make Up Your Mind About EMF’s. September 2, 2006

Posted by healthyself in .2 mHz, 2.4 GHz, 5 Hz, 50 Hz, 60 Hz Magnetic Fields, Addiction, Biological Activity, Biological Effects, Blogroll, Cancer Protection, Cell changes, Cell phone industry, Cell phone safety, Cell phone towers, Cell Phones, Cells, Central Nervous System, Children, Children's health, Chromosomal damage, Decision Making, earphones, Electromagnetic pollution, Electromagnetic waves, Electrosensitivity, Electrosmog, ELF, Emergency Medicine, EMF Research, EMF's, EMR, Environment, Epidemiologists, Family, Funding, genes, GHz, Grants, Health, High Frequencies, high voltage transmission lines, HOuseholds, Hz, Immune system, Kids, Lack of Concentration, Lifestyle, Long Term Health Risks, Low Frequencies, Medical Research, Men's Health, MHz, Microwave exposure, Mitigation, mobile telephones, nerves, Noise, Penetration, Pets, Public Policy, Pulsed Radiation, radiation, Research, Risk of Disease, Safe Levels, School administrators, School Boards, Schools, Sleep disturbances, Stress, Suicide, transmission, Tweenies, University, VDT, WiFi, Women's Health, Workplace.
add a comment

“To get at the explanation of EMF effects, we need scientists to talk to each other and collaborate across the disciplines. For that, we need a public funding structure that encourages novel interdisciplinary research instead of reinforcing existing unproductive programmes that discriminate against ‘maverick’ researchers.”

“At the moment, research grants and graduate students tend, more and more, to be exclusively awarded to big groups in prestigious universities, which overwhelmingly engage in big, safe projects that have no incentive to be innovative, and indeed, positively discriminate against ‘dissenters’ and ‘mavericks’.”

“Radical changes are needed in the education of our scientists. Few biologists understand the physical sciences and mathematics well enough to appreciate the contribution they can make to the life sciences; few physical scientists know enough biology to apply their expertise effectively to it. Not enough progress is being made in areas that lie between the traditional disciplines, and even when it is, the results are too often ignored because too many scientists can’t understand what their colleagues are talking about.”

http://www.mindfully.org/Technology/2004/EMF-Electromagnetic-Fields15dec04.htm

What Frequencies Can Be Heard? September 2, 2006

Posted by healthyself in 000 Hz, 10, 10000 Hz, 120000 Hz, 15102 Hz, 16000 Hz, 16961 Hz, 17959 Hz, 20, 20 Hz, 200, 20000 Hz, 200000 Hz, 45, 45 Hz, 45000 Hz, 5 Hz, 50 Hz, 85, 85000 Hz, Animal Research, Biological Activity, Blogroll, Cell phone safety, Communication, Ear, Electromagnetic pollution, Electromagnetic waves, Electrosensitivity, Electrosmog, Emergency Medicine, EMF Research, EMF's, EMR, High Frequencies, high voltage transmission lines, Low Frequencies, Medical Research, Microwave exposure, nerves, neurons, Noise, pressure, Risk Factor, sensations, Sound, transmission, Vibration, Waves.
8 comments

..”the human ear is capable of detecting sound waves with a wide range of frequencies, ranging between approximately 20 Hz to 20 000 Hz. Any sound with a frequency below the audible range of hearing (i.e., less than 20 Hz) is known as an infrasound and any sound with a frequency above the audible range of hearing (i.e., more than 20 000 Hz) is known as an ultrasound. Humans are not alone in their ability to detect a wide range of frequencies. Dogs can detect frequencies as low as approximately 50 Hz and as high as 45 000 Hz. Cats can detect frequencies as low as approximately 45 Hz and as high as 85 000 Hz. Bats, who are essentially blind and must rely on sound echolocation for navigation and hunting, can detect frequencies as high as 120 000 Hz. Dolphins can detect frequencies as high as 200 000 Hz. While dogs, cats, bats, and dolphins have an unusual ability to detect ultrasound, an elephant possesses the unusual ability to detect infrasound, having an audible range from approximately 5 Hz to approximately 10 000 Hz.”

http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/sound/u11l2a.html