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Transcript of The Radio
*Easier to find a radio than a television.
*It doesn´t need electricity, with a pile is enough.
*in a disaster(earthquake), the radio does not stop working. *Difficulty to feedback.
*Communication is unilateral The discovery of electromagnetic waves was one of the most important advances of the nineteenth century. When Maxwell postulated the existence of these waves got to clarify the problem of the nature of light. Electromagnetic waves Electromagnetic waves are the waves produced by the oscillation or acceleration of an electrical charge. Types of electromagnetic waves: gamma rays, X, ultraviolet, infrared, microwaves, visible light, radio waves. Gamma rays: originates in the process of stabilization in the nucleus of the Atom after radioactive emissions. Their radiation is very dangerous for living beings. X rays: are dangerous to life: prolonged exposure can cause cancer. UVR: the Sun is a source of ultraviolet rays. The UVR can destroy life and are used to sterilize. The ozone layer protects us from the grape. Visible light: humans have sensors to detect it, such as eyes. They originate in the acceleration of the electrons in the energy transit between orbits allowed. Infrared: they are emitted by warm bodies. Our skin also senses the heat and therefore the infrared radiation. Microwave: they are used in communications from radar or UHF (Ultra-High-frequency) band and cookers ovens. Radio waves: they are used in telecommunications and include radio and television waves. They originate in the oscillation of the electric charge in the antennas. Advantages Disadvantages ELECTROMAGNETIC WAVES •Electromagnetic waves have many utilities.
•They are used in the fields of communication, medicine, industry, ... •Harmful effects in our health.
•The effects in our health are depending on their frequency. What was life like
before the radio? Problems with Morse code: When the telephone was invented people didn't have to use the telegraph. Communication was very limited.
Before the radio was invented, a telegraph or telephone was used to send news messages via Morse code.
1. Offices were needed to send and receive messages.
2. Since most people did not understand Morse code, an operator translated messages. But the problem with the telephone was that messages could only travel between places connected by wires. (cables) APPLICATIONS -cochlear implant Cochlear implant The device consists
of two parts: AUDIO TELEPHONY VIDEO NAVIGATION RADAR Emergency services Transmitting digital radio data Heating Mechanical Strength medical application *It is a medical device that can be implanted.
*Consists of a translator that transforms sound into electrical signals that stimulate the auditory nerve.
*Inside: the part that requires surgery and will
be placed in the device with a magnet transducer
*External part: The part where the sound is processed and transmitted encoded surround information collected to the inside. -MRI
-esthetics Definition: A wave it’s a disturbance, oscillation or vibration that travels through space and matter accompanied by a transfer of energy.
Average level of motion
Speed References http://www.nlm.nih.gov/medlineplus/spanish/ency/article/007203.htm
http://es.wikipedia.org/wiki/Implante_coclear Electromagnetic waves
Gravitational waves One-dimensional waves
Three-dimensional waves Transverse waves
Longitudinal waves Periodic waves
Non-periodic waves http://wiki.answers.com/Q/What_are_the_advantages_and_disadvantages_of_radio_communication
http://en.wikipedia.org/wiki/Wave THE END QUESTIONS HISTORY Guillermo Marconi received the Nobel Prize in Physics for the
"wireless telegraphy" -- galena radio Invention of the transistor at the end of the 40s 1909 Without the experiments of:
Guillermo Marconi, Tesla, and Popov.
It could be impossible to have a radio nowadays. 1962 Lafayette HA-700