Microwaves are low on the electromagnetic spectrum. The electromagnetic spectrum is a range of all the possible electric radiation. Frequency of a wave is the number of waves per second and the frequency of a microwave is between 300 MHz and 300 GHz. The wavelength of a wave is the distance from one peak of a wave to the peak of a following wave and a wavelength of a microwave varies from one millimeter to thirty centimeters. The frequencies range from ultra high frequency to super high frequency to extremely high frequency. The microwave was discovered by Heinrich Hertz and predicted by James Clerk Maxwell. In 1864, James Clerk Maxwell theorized about microwaves until he predicted equations that would prove the existence of microwaves. In 1888, Heinrich Hertz took these equations and used them in an experiment. He made an apparatus that produced waves and detected these waves. The experiment displayed the different wavelengths of certain waves, such as the short wavelength of microwaves. The discovery of microwaves permitted it to be used for commercial purposes.
Microwave ovens are the best example of a commercial usage of microwaves. Microwave ovens use microwaves at a frequency of 2450 MHz. The Microwaves travel and cause the water, fat, and sugars to vibrate resulting in the food’s temperature rising. This type of energy is called Dielectric energy. This benefits the food making process and anyone who buys TV dinners. Another instance of microwaves is cell phones. Cell phones use an antenna and a little transmitter to connect to the microwaves emitted in the air. To make cell phones more attractive for buyers, they minimized the transmitters and antennas. The microwaves used in phones make it possible for a person to receive calls from any location, this is especially important in emergencies. Broadcasting transmissions, such as cable TV and the Internet, use microwaves to transmit the signal in order to broadcast. These two sources that use microwaves permit faster communication between all areas of the world. These two sources that use microwaves are the most popular ways of entertainment for most of the United States. The commercial industry benefits from these products that use microwaves.
Current studies prove indecisive about the effects of microwaves. Microwave ovens can cause damage to the eyes. If a person were to press their face on the microwave oven, it can cause cataracts in the eyes. The best advice to protect against this effect is to stay a couple feet away according to Dr.
Maxwell in 1864, who said that electromagnetic waves should have the ability to be propagated
Wireless is a methodical account of the early development of wireless telegraphy and the inventors who made it possible. Sungook Hong examines several early significant inventions, including Hertzian waves and optics, the galvanometer, transatlantic signaling, Marconi's secret-box, Fleming's air-blast key and double transformation system, Lodge's syntonic transmitter and receiver, the Edison effect, the thermionic valve, and the audion and continuous wave. Wireless fills the gap created by Hugh Aitken, who described at length the early development of wireless communication, but who did not attempt "to probe the substance and context of scientific and engineering practice in the early years of wireless" (p. x). Sungook Hong seeks to fill this gap by offering an exhaustive analysis of the theoretical and experimental engineering and scientific practices of the early days of wireless; by examining the borderland between science and technology; depicting the transformation of scientific effects into technological artifacts; and showing how the race for scientific and engineering accomplishment fuels the politic of the corporate institution. While the author succeeds in fulfilling these goals, the thesis, it seems, is to affirm Guglielmo Marconi's place in history as the father of wireless telegraphy.
Millions of people around the world use cell phones on a daily basis and people hardly realize the terminal risks. Cell phones may seem completely harmless, but they actually emit radio waves that can be hazardous towards the human body. Each time someone makes a call or receives a call, a type of cancerous radiation is given off by the cell phone in order for the user to communicate with the person on the other side of the line. Since the amount of cell phone users has rose rapidly, more people are being exposed to this kind of radiation. As cell phones undergo advancements, people are starting to use them more often, leading to an increase in the amount and length of calls each day. Some believe that these radio waves do no such harm to your body due to the radiation wave being weak but in reality, exposure to any kind of radiation is never safe. Radio waves might not affect the human body immediately, but after a long period of time the effects are bound to reveal. Cell phones can increase the risk of cancer because its radiation affects brain cells, causes tumors, and is hazardously absorbed by the tissues in the body.
Three types of heat transfers help solar cookers use the sun’s energy to cook food. Heat is always transferred from the warmer object to the cooler object. Heat is also transferred to and through some materials better than others. The three types of heat transfers are radiation, conduction, and convection. Convection is the heat transfer by movement through materials such as air or a liquid. Materials like these are called mediums. Convection is the primary way heat can be transferred through liquids and gases. To classify a heat transfer as convection, hot air has to rise up to equally heat the air around it. Box solar cookers have to retain this hot air to cook food, so the cookers have to have lids with a transparent covering. The transparent covering shuts in all of the hot air and keeps out the cool air. The second heat transfer is the transfer of heat between two objects, or substances, that are directly in contact with each other. This heat transfer, called conduction is the primary way heat can be transferred through solids. In gases and liquids, conduction works poorly because the atoms have a great deal of space between them. Since they have a lot of space between each other, they can’t communicate heat to one another. The solid, aluminum foil, is commonly used in homemade solar ovens because it is a metal. It is well known metal is a great conductor of heat. Since metal (aluminum) is a great conductor of heat, whatever comes in contact with it will gradually absorb the heat from the metal. The third type of heat transfer is radiation. Radiation is the transfer of energy (heat) through space by electromagnetic waves. Solar energy reaches Earth by radiation (Pearson 485). When an energy wave comes directly in contact with...
For example, talking too much over cellphones can damage hearing. According to study in Use of Cell Phone Long Hour Cause Hearing Loss, “Those who used mobile phones for more than four years had more hearing loss in high-frequency ranges in their right ear, the ear most held the phone to, than those who used the mobile phone for one to two years” (Dohheny). Another example is using cellphones for a long period or too much is bad for the eyes. The vision of the eyes can get weaker by looking at the cell phone screen. According to the article Does staring at screens all day really damage your eyes?, found that 61 percent of Americans have experienced eye strain after prolonged use of electronic devices — nearly 2 out of every 3 people (Hill). One of my friends in school was wearing glasses when I saw her one day. I said, “What happened? Why are you wearing glasses?” She said, “My eyes are in pain.” She told me that she had been typing all night on her cell phone. The reflected light that comes from electronic devices’ screens can cause eyestrain because of long-period concentration on the screens. Furthermore, cell phone can also damage the brain and possibly cause brain tumors. Lloyd Morgan, a member of the Bioelectromagnetics Society says, ' 'Science has shown increased risk of brain tumors from use of cell phones, as well as increased risk of eye cancer, salivary gland tumors, testiculars cancer,
Cell phones have made a big impact on the world, for example, people are using them daily, and they have influenced science, politics, and many more fields.
...ire in his kitchen. Due to this popularity, Patrick Michaud, a professor at Texas A&M University, conducted an experiment proving that Pop-Tarts could produce flames if caught in the toaster. This evidence brought about a large number of lawsuits and ever since that time, Pop-Tarts have carried the warning on their label: “Do not leave toasting appliances unattended due to possible risk of fire.”
The dangers of the electromagnetic can be low on danger and high on danger. Depending on the amount of how much the body absorbs verifies the lethality of the EMFs.
Every invention ever known to man had pioneers or people who contributed to the creation of the product. Radio had many pioneers that allowed for its creation and their names are Heinrich Hertz, Nikola Tesla, Ernst Alexander, Edwin Armstrong, Guglielmo Marconi, Lee DeForest, Frank Conrad, Reginald Fessenden, and Edward Armstrong. It all started with a German physicist named Heinrich Hertz who in 1884 proved that you could transmit and receive electric waves wirelessly. Hertz thought that the work he had done had no use whatsoever but little did he know that what he done is considered the fundamental building block of radio, and that is the reason why every frequency measurement is named after him (Short). In that same year a Serbian-American inventor named Nikola Tesla came to the U.S and sold patents to his inventions to a man named George Westinghouse. After that Tesla established his own lab which is where he built the tesla coil , an induction coil that is still used in radio today (Short). The next progression of radio focused on more than just the transmission of waves, the new focus was transmission of speech. The first to begin to add speech into the radio mix was Ernst Alexander, a Sweden born inventor who developed the first alternator to make speech transmission possible (Short). This was so new to the s...
A spectrum is an image or distribution of colour of any electromagnetic radiation arranged in a progressive series according to wavelength.
Nature of wave: It is an electromagnetic wave as it does not necessarily require a medium for p...
The microwave is a prime example of technology making us happy. If we were to get rid of the microwave, many people would be angry because it is a very helpful and time saving device. If there was no microwave people would not be able to defrost the ground meat they forgot to leave out, nor would they be able to cook a hot pocket for lunch when they were short on time. Some people believe that items that are efficient make society happy.
waves are further divided into two groups or bands such as very low frequency (
Cell phones represent a type of technology that has been around for more than over fifty years; it has only been recently that many people began to use cell phones as a major part of their everyday life. In the past cell phones were for business people to conduct their business, but in today’s society every one owns a cell phone. Cell phones are interesting, useful and also play a major role in our life’s bringing people closer and keeping in touch with one another. Most people do not know and understand the physics of a cell phone. Cell phones are also known as cellular phone, hand phone, and commonly known as a mobile phone. A cell phone is an electric device that can make and receive calls, over and automatic repeat request (radio link petrol -RLP) used over wireless air interdace.it us a portable telephone that uses and receive phone signals.it also divides that earth into small regional called cells.in the resent estimates there are over 190 million people using mobile phone. One of the primary health concerns is the impact of cell phone radiation, by radio waves by which it operates.
One of the physiological effects of watching television in excessive amounts is eye-strain. It is true that there are specifications for watching television; television should be 5 m. away from the eye, the room should be adequately lit, television should be placed at the same height with our eyes, etc. However, these do not prevent our eyes from getting tired if we keep watching television for a long time. Another effect is obesity, which is widely observed in people who like watching television and eating snacks everyday (there is even a term “television snacks” to refer to fast food that is suitable for eating in front of the television). television is such a powerful machine that people cannot get away from it – it is addictive. Apart from the physiological effects, television also causes psychological effects. One is a result of being exposed to