You can catch the subtle tone in their voice, see their expression as it changes from sad to outraged, and you can look them in the eye to see if you trust them. For young people especially, having a cell phone or iPod in hand and at the ready is the default mode while walking the streets. That means much less chance of conversation with the people who populate their real lives. Last weekend I went back for a reunion of old friends at my alma mater, the University of Missouri-Columbia, located in the heartland of America.
History[ change change source ] Mobile phones in the s through s were large and heavy, and most were built into cars. In the late 20th century technology improved so people could carry their phones easily. Martin Cooper from Motorola made the first call using a mobile phone init did not use the type of cellular mobile phone network that we use today.
The first mobile phone networks were created in the late s in Japan. Now almost all urban areas, and many country areas, are covered by mobile phone networks.
Inside a mobile phone Technology[ change change source ] A cell phone combines technologies, mainly telephone, radioand computer. Most also have a digital camera inside.
Cell phones work as two-way radios. They send electromagnetic microwaves from base station to base station.
The waves are sent through antennas. This is called wireless communication. Early cell telephones used analog networks. They became rare late in the 20th century. Modern phones use digital networks. The first digital networks are also known as second generation, or 2G, technologies.
The difference is in communication protocol. Other countries like Japan have different 2G protocols. A few 2G networks are still used. The radio waves that the mobile phone networks use are split into different frequencies.
The frequency is measured in Hz. Low frequencies can send the signal farther. Higher frequencies provide better connections and the voice communications are generally clearer. Four main frequencies are used around the world: Today there are mobile phones that work on two, three or four frequencies.
The most advanced phones work on all frequencies. They are called 'world' phones and can be used everywhere.?Persuasive Speech Specific Purpose: To persuade my audience to stop using their cell phones while driving a vehicle because it is extremely irresponsible and dangerous.
Central Idea: Using a cell phone while driving is dangerous to yourself and others on the road and is . Oct 21, · Best Answer: what about how cell phones have evolved over time, like the first mobile was only black and white with a limited amount of features and now with the iphone its practically a computer with camera features, blutooth, etc.
then you could talk about the range of different models there are on the Status: Resolved. Cell phones or smart phones are not allowed. Conversing is prohibited in the prep room. ; R R extractions on notes: A speaker may use only one note card that is no larger than ex. inches when delivering the speech.
“Raising population” section aims to demonstrate how addicting cell phones are, but comes up short, especially with overly quoted sections from a newspaper .
The first mobile telephone call was made on April 3, by Martin Cooper, a former Motorola inventor, who is known as "the father of the cellphone". Dec 14, · Best Answer: Example of a thesis statement: Using a cell phone while driving is dangerous and increases your chances of getting into an accident.
(This will be in your opening paragraph) Para 2: Talking on a cell phone while driving distracts drivers because they are concentrating on their conversation rather than their attheheels.com: Resolved.