Cell Phones
One of the things that could be essential in my life could be the cell phone not only for me it is for everybody because no one can do anything without it.
WHY?
I say the cell phone because without the phone I could not communicate to my parents whom are in another country and also it is how I see my friends and learn many things.
HOW CELL PHONES WORKS?
Cell phones use radio waves to communicate. Radio waves transport digitized voice or data in the form of oscillating electric and magnetic fields, called the electromagnetic field (EMF). The rate of oscillation is called frequency. Radio waves carry the information and travel in air at the speed of light.
Cell phones transmit radio waves in all directions. The waves can be absorbed and reflected by surrounding objects before they reach the nearest cell tower. For example, when the phone is placed next to your head during a call, a significant portion (over half in many cases) of the emitted energy is absorbed into your head and body. In this event, much of the cell phone’s EMF energy is wasted and no longer available for communication.
Many modern smart phones also contain more than one type of antenna. In addition to the cellular antenna, they may also have Wi-Fi, Bluetooth and/or GPS antennas.
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