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ThinkTech: What is the nature of light? -

Thursday, May 24, 2012

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Sunday, March 25, 2012

ThinkTech: What is the nature of light?

Turn off all mobile phones and electronic devices during takeoff or landing of a plane.
Even no one is using his mobile phone during the flight?
Why do computer speakers buzz when a cellphone is about to ring?
Temporarily lost home WiFi signal every time you turn on the microwave.
All about an increasing of interference effects due to specific nature of electromagnetic radiation. So what is the electromagnetic nature of light? You can see that light is just one dual form of energy known as electromagnetic radiation with frequency and Wavelength. The small wavelength signal is the more it has high frequency, similar stuff as radio, TV and microwaves, just a different frequency. The light that we can see encompasses only a very small tiny of the entire electromagnetic radiation spectrum. This spectrum includes everything from low frequency radio waves up to extremely high frequency (and very dangerous) gamma radiation: Visible light covers a frequency range from around 5 x 1014 Hz for red light to 7.5 x 1014 Hz for violet light. That’s between one-half to three-quarters of a million billion Hz! These very high frequencies are more conveniently described in the form of above wavelengths.

All this interference probably shouldn’t be all that surprising, considering the growing number of wireless and remote devices scattered about the average worldwide household: not just microwave ovens, but other WiFi access hotspot points, cordless phones, wireless video cameras, game controllers, Bluetooth devices, sometimes even bad electrical connections or fluorescent lights. No wonder RF interference is particularly problematic in population-dense areas. The real miracle is that it doesn’t happen more often.

Granted, the radio frequency segment of the electromagnetic spectrum covers a pretty wide range, and regulatory agencies are pretty stringent about assigning radio frequencies.

  • AM radio: 535 kHz to 1.7 MHz
  • Short wave radio: 5.9 MHz to 26.1 MHz
  • TV stations (channels 2 through 6): 54 to 88 MHz
  • TV stations (channels 7 through 14): 174 to 220 MHz
  • FM radio: 88 MHz to 108 MHz

You’d think that would be sufficient, but modern technology includes all kinds of small household devices, each of which also uses a specific band in the spectrum:

  • Garage door openers/alarm systems: 40 MHz
  • Cordless phones: 40 MHz to 50 MHz (Some newer versions are 900 MHz.)
  • Baby monitors: 49 MHz
  • Radio-controlled airplanes: 72 MHz
  • Radio-controlled cars: 75 MHz
  • Wildlife tracking collars: 215 MHz to 220 MHz
  • MIR Space Station: 145 MHz to 437 MHz
  • Cellphones: 824 MHz to 849 MHz
  • Air traffic control radar: 960 MHz to 1,215 MHz
  • Global Positioning System: 1,227 MHZ to 1,575 MHz
  • Deep space radio communication: 2,290 MHz to 2300 MHz

Microwave ovens generally emit signals in the same 2.4 GHz frequency band that most WLANs employ, so occasional crossed signals are almost inevitable.

That’s also why the signal might sometimes be weak if too many people are using WiFi access points in the same frequency range, in the same general region, causing slower rates for Web browsing and file downloads.

To the Point: Noting that there is a 111 MHz gap between the high end of the cell phone frequency and the low end of air traffic control radar systems, yet only a 12 MHz gap between the high end of air traffic control radar and the low end of the Global Positioning System. So why do I have to turn my cell phone off during every single flight? Isn’t the GPS a far greater interference risk, or am ThinkTech is missing some crucial point? Thoughts? Comments?)

The point is, it’s clear from this ever-growing list that the technology boom is taking a bigger and bigger bite out of the radio frequency spectrum every year or rather, new wireless devices are multiplying like rabbits, forcing us to carve out ever-smaller niches in the spectrum to make room for everything. Lee informs me that HDTV employs micro-frequencies, although I haven’t been able to independently verify that too much techs to wade the pace of all growing devices around us on daily bases.

Some might argue that the problem of interference pales in comparison with unknown long-term adverse health effects that might be related to prolonged exposure to all these electromagnetic fields. “Cell phones cause cancer!” scream the fear-mongering headlines — echoes of the power line controversy in the 1980s and 1990s.

On the flip side, one doesn’t like to blithely dismiss such concerns out of hand, especially if one has ever perused the gruesome historical archive photos of early X-ray pioneers. People used to think X-rays were harmless, too, so much so that they got “bone scans” for a lark, and even used X-ray machines in shoe stores for a while to determine sizing. Many scientists and physicians who worked routinely with X-rays lost their hair, developed cancerous tumors, and had to have various extremities amputated before people finally realized, hey!. Today because scientist took further the matter, by carefully documenting the damage of the burns, serial amputations and diseased lymph nodes leading up to his death. Scientist end up by understanding the effects, with today ability to develop precautionary measures, so we could reap the benefits of X-ray technology while still protecting our health.

However, the dangers of X-rays were pretty clear-cut and easily observed; ditto with the high-energy gamma rays associated with nuclear bombs or power plants. Both are examples of ionizing radiation, which causes cells to mutate and sometimes die. Radio frequency energy is far, far lower, insufficient to cause mutation of biological cells. That’s not to say it doesn’t have biological effects: get enough RF energy focused in one place, and it can heat tissue; such an increase in body temperature can certainly cause some damage, particularly to the eyes and testes. But we’re talking huge amounts of RF energy, not the incidental signals emitted by cell phones, microwaves, and other wireless devices.

BUT with so many more RF devices popping up in population-dense regions, and people spending longer amounts of time using such devices, could there be any long-term ill effects from prolonged exposure even to the tiny RF signals being constantly emitted around us?

The middle ground is to call for more research, specifically tightly controlled studies, in hopes of settling the matter once and for all. An article on the NIH Website cites several major studies showing no link between cell phones and cancer, but stops short of declaring this to be a definitive answer, because those were short-term studies.

Still, the FDA and the Federal Communications Commission have taken preventive steps… just in case. For instance, there are limitations in place regarding how much RF energy cell phones are allowed to give off, and these amounts are much lower than the levels shown to cause damage in the aforementioned lab rats. Cell phone manufacturers are required to report the RF exposure of all their phone models to the FCC.

As for ThinkTech part, we’ll stick to being annoyed by WiFi interference problems, and ignoring the strange voices being emitted from our computer speakers. For pulling the project together in record time, We will continue with Mobile operator Signal to help out understand how doesn’t Mobile Work for normal people and we will make it simple to be understood by everyone with just reading capability….To be continued….

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