2. Combination of the ideas of the
telephone and Radio.
Extremely sophisticated Radio.
Used to make mobile telephone calls across a
wide geographic area, served by many
public cells, allowing the user to be mobile.
3. Can make and receive telephone calls by
connecting to a cellular network provided
by a mobile network operator.
Transmit and receive Radio Frequency
(RF)signals in order to communicate,
i.e. use microwave radiation to
communicate.
4. “If we continue to develop our technology
without wisdom or prudence, our servant
may prove to be our executioner”.
- Omar N. Bradley
5. RADIATION
EFFECTS
A part of the radio waves emitted by a mobile
telephone handset are absorbed by the human head.
The radio waves emitted by a GSM handset can have
a peak power of 2 watts, and a US analogue phone
had a maximum transmit power of 3.6 watts.
The best known measure is SAR (Specific Absorption
Rate), which measures the RF power absorbed by the
human body.
6. THERMAL
EFFECTS
•A typical GSM digital cellular phone operating at a maximum average power
output of about 0.25 watts (W) might results in a SAR of about 0.5-1.5 W/kg
averaged over a gram of tissue.
•This is often associated with a very low rise in brain temperature
(maximum 0.1º C) (Anderson and Joyner 1995; Vaberg 1997; van Leeuwen et
al. 1999).
•This temperature rise increases with the length of the call as shown in this
graph.
7. EFFECT ON
HEART
•Studies suggest, the strength of these fields will not affect ordinary
heart rhythm or function.
•Can present a danger to those with an implanted pacemaker, internal
defibrillator or similar device.
•Problems most likely to arise when pacemakers and defibrillators are
being programmed or reset by medical staff.
•Recommended that keep cell phones and media players at least six
inches from the generator (implanted device).
8. FOR MORE DETAILS &FOR PREPARE
SLIDE:
Slidet@gmail.com
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