The pit marks are measured to be 6.0 cm apart. With the help of frequency modulation, the caller's sound waves are encoded in microwaves by changing its frequency. The electrons in a water molecule tend to remain closer to the oxygen nucleus than the hydrogen nuclei (Figure \(\PageIndex{3}\)). Microwaves are used in cell phones. https://byjus.com/physics/electromagnetic-spectrum-microwave Microwaves are often used in radar, telemetry and microwave ovens. These are also used to transmit telephone conversations. Unlike longer radio waves, they do not bend around land obstacles but go in line of sight. The weaker the signal reaching the detector, the more rain the microwaves have passed through. These encoded microwaves are transmitted to cell tower via air. So we can use microwaves to cook many types of food.. Microwave is the carrier of the signals of cell phones. The selling point of microwave ovens is that they heat the food with a lower power input. But microwave ovens weren't sold as "this is a lot more awesome, because it uses microwaves!". Shorter microwaves are used in remote sensing. So the first part of the answer to your question is simple enough - if microwave ovens used visible or IR light, we would not call them microwave ovens, just ovens. Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter corresponding to frequencies between 300 MHz and 300 GHz respectively. Microwaves and their uses, and how cell phones and radar work. Learn about and revise electromagnetic waves, their uses and dangers, and the absorption and emission of radiation with GCSE Bitesize Physics. Mobile phones use microwaves, as they can be generated by a small antenna, which means that the phone doesn't need to be very big. Microwaves sent through the atmosphere will be absorbed by water so they can be used to monitor rain. Although microwaves were first produced and studied in 1886 by Hertz, their practical application had to await the invention of suitable generators, such as the klystron and magnetron. Microwaves use 2.5 GHz not because it is water's reasonant frequency, but because that was a convenient magnetron frequency to make back in the day. This creates two separated centers of equal and opposite charges, giving the molecule a dipole moment . Microwaves are good for transmitting information from one place to another place because microwave energy can penetrate through, light rain, snow, clouds, and smoke. Microwaves of 2.45 GHz are commonly used in microwave ovens. The waves reflect from the inside walls of the oven to produce an interference pattern of standing waves whose antinodes are hot spots that can leave observable pit marks in some foods. Microwave transmissions Wireless technology uses microwaves and radio waves to transmit information. 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