|1 megahertz (MHz) = 1 000 000 Hertz
1 gigahertz (GHz) = 1 000 000 000 Hertz
A Hertz is the unit of frequency in the International System of Units
1 hertz = 1 cycle per second
1 cycle = 1 wave length
1 cycle = period (T)
No, radio waves do not go around obstacles and they do not travel by following little paths in the air as shown in some illustrations. Radio waves move like the waves created when a pebble is tossed into calm water.
- Are totally reflected (light in a mirror) or partially reflected (light going through a window);
- Are absorbed (the heat of the hood of a car in the sun or food in a microwave oven);
- Pass through some materials (TV programs captured using the “rabbit ear” antenna in your living room).
Even if the source of emission is outside the house (e.g., smart meters, cellphone towers, etc.), people inside are still exposed to them. Cellphones work inside your house because the radio waves come in from outside. The level of penetration depends on what your house is made of.
In this regard, please read the charts in « Radiofrequency attenuation based on construction materials » in the “Documents” section.
No. The way that radio waves disperse in the air is highly dependent on the features of the antenna emitting them, but they never travel in little straight paths through the air. They move more like the waves created when you drop a stone into the water, except in 3D. Imagine a spherical loudspeaker. It emits sounds in all directions. This is exactly how radio waves are emitted by networked or smart meters.
The radio waves are emitted in all directions and they can penetrate everything around them.
Yes and no! It all depends on what your house is made of. Brick does not provide very good protection. Glass and gyproc provide none at all! But concrete provides partial protection. Either way, if your cellphone is working inside your house, it means that radiofrequencies are getting in.
That means you are exposed to the radio waves of your networked or smart meter and those of your neighbours.
Please read the charts in « Radiofrequency attenuation based on construction materials » in the “Documents” section.
Yes, a very significant impact. The intensity of any electromagnetic field diminishes as you get farther from the source generating it.
Take a smart meter that emits a power density of 45,000 μW/m2 at a distance of 1 m. At 2 m from the meter, the power density is 11,250 μW/m2. It is only at 67 m that the power density is reduced to 10 μW/m2, the maximum acceptable exposure according to the Institute of Building Biology (see link).
If you install a Smart Meter SafeGuard on that meter, however, its attenuation capacity reduces the power density to 450 μW/m2 at 1 m. To get to an exposure of under 10 μW/m2, you only need to move 7 m away.
Click to consult The Building Biology Evaluation Guidelines 2015.
The dictionary defines radiofrequency as the frequency of a radioelectric wave (or radio wave).
As for “microwaves,” according to Wikipedia, they are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter and frequencies between 300 MHz (100 cm) and 300 GHz (0.1 cm).
WiFi, Bluetooth, wireless phones (DECT), Wimax, cellphones and microwave ovens all use waves of these lengths and frequencies.
Right now, networked and smart meters emit waves in the range of 900 MHz (in other words, microwaves). At some point in the future, the WiFi circuit on the meters will be activated.
http://fr.wikipedia.org/wiki/Micro-onde#Bandes_de_fr.C3.A9quence (Bandes de fréquence)
http://fr.wikipedia.org/wiki/Spectre_électromagnétique (Usages et classification)