Seunggun

Notes-Cellphones
 * There are two types of radiation: Non-ionizing radiation and Ionizing radiation.
 * Non-ionizing radiation does not have the enough power to break apart atoms: Radio waves, micro waves, visible light, infrared rays, and ultra violet rays
 * Ionizing radiation have the power to break atoms and molecules : X-rays, gamma rays.
 * Cellphones use radio waves, which are the least energetic waves of electromagnetic waves.
 * Exposure to radio waves for a long time can heat-up body issues.
 * The cellphone radiates low level of power, but if a small amount of power is absorbed by a human head concentrates on one very small area in the brain so as to form a "hot spot". When this happens, the brain can be heated up and be damaged. This called the Thermal effect.
 * The thermal effect can be prevented because our body cools our temature down so it prevents from getting a 'hot spot'.

__How do Mobile Phones Effect Human Health?__

I think mobile phones doesn't effect our health. There are two types of radiation; non-ionizing radiation and ionizing radiation. The non-ionizing does not have enough power to destroy atoms and molecules. Ionizing radiation can destroy atoms and molecules. Mobiles are radio waves, and iradio waves are non-ionizing radiation. This means that the radio waves from the mobile phones can not destroy atoms and molecules. Also, it is the weakest wave of the electromagnetic radiation. Although the thermal effect can overheat our brain, our body is like an air-con system, which cools down our brain to prevent 'hot spots' and getting over heated. Even though more research has to be done, I think mobile phones can't effect human health.

__How Does Mobile Phones Use Electromagnetic Radiation?__

When we make a call with our mobile phones, it spreads electromagnetic radiation to the small cells. The cell leads to the tower that transmits the radiation to the central hub, where it transmits the radiation to the communication satellites. The satellite can send and receive radio, television, and telephone signals.The communication satellite rebounds the radiation to the tower near to the destination. That tower transmits the radiation to the cells, and the cells lets you connect with the other phone. If we use communication satellites, we can keep contact with many other people around the world.

__Conclusion__

__ Picture 1 __ Source: Picture 1: http://static.howstuffworks.com/gif/cell-phone-radiation-spectru.gif