Overpowered: The Dangers of Electromagnetic Radiation (EMF) and What You Can Do about It by Martin BlankKeys, wallet, cell phone . . . ready to go! Cell phones have become ubiquitous fixtures of twenty-first-century life—suctioned to our ears and stuck in our pockets. Yet, we’ve all heard whispers that these essential little devices give you brain cancer. Many of us are left wondering, as Maureen Dowd recently asked in the New York Times, “Are cells the new cigarettes?”
Overpowered brings readers, in accessible and fascinating prose, through the science, indicating biological effects resulting from low, non-thermal levels of non-ionizing electromagnetic radiation (levels considered safe by regulatory agencies), coming not only from cell phones, but many other devices we use in our homes and offices every day.
Dr. Blank arms us with the information we need to lobby government and industry to keep ourselves and our families safe.
GCSE Science Physics (9-1) Properties of Waves 2
Light is just part of a continuum of waves called the electromagnetic spectrum. This spectrum includes many types of wave that you will recognize including X-rays and infra-red. The electromagnetic spectrum is normally given in order of decreasing wavelength or increasing frequency. A summary of the spectrum showing the wavelength and frequency is as follows:. The properties dangers and applications of the various waves on the em spectrum are in the table below. Just a confusion I have with understanding this.
At sufficiently high flux levels, various bands of electromagnetic radiation have been found to cause deleterious health effects in people. The last quarter of the twentieth century saw a dramatic increase in the number of devices emitting non-ionizing radiation in all segments of society, which resulted in an elevation of health concerns by researchers and clinicians, and an associated interest in government regulation for safety purposes. Sufficiently strong electromagnetic radiation EMR can cause electric currents in conductive materials that is strong enough to create sparks electrical arcs when an induced voltage exceeds the breakdown voltage of the surrounding medium e. For example, the radio emissions from transmission lines have occasionally caused shocks to construction workers from nearby equipment, causing OSHA to establish standards for proper handling. EMR-induced sparks can ignite nearby flammable materials or gases, which can be especially hazardous in the vicinity of explosives or pyrotechnics. Dielectric heating from electromagnetic fields can create a biological hazard. For example, touching or standing around an antenna while a high-power transmitter is in operation can cause severe burns.
The video and text below describe some of the qualities and uses of different waves on the electromagnetic spectrum. Skip to main content. Search form. Sign up Log in. Uses of Electromagnetic Waves Quick revise Introduction.
Electromagnetic spectrum , the entire distribution of electromagnetic radiation according to frequency or wavelength.
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