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Microwaves are produced inside the oven by an electron tube called a magnetron. The microwaves are reflected within the metal interior of the oven where they are absorbed by food. Microwaves cause water molecules in food to vibrate, producing heat that cooks the food.12-Dec-2017
How are microwaves naturally produced?
Stars, including the Sun, are natural microwave sources. Under the right conditions, atoms and molecules can emit microwaves. Man-made sources of microwaves include microwave ovens, masers, circuits, communication transmission towers, and radar.
How is microwave radiation transmitted?
6.6. Electromagnetic radiation at high frequencies can be transmitted through a coaxial cable that consists of an inner copper wire, an insulating (plastic) layer, and an outer copper braid.
What is the source of microwave irradiation?
Microwave irradiation method is a novel graphene synthesis method with fast processing time. This method uses a high-frequency wave to heat the starting materials (i.e., graphite, amorphous carbon, and other carbon sources) to a high temperature in a short time.
Do humans emit microwave radiation?
Yes, all objects, including human bodies, emit electromagnetic radiation. The wavelength of radiation emitted depends on the temperature of the objects. Such radiation is sometimes called thermal radiation. Most of the radiation emitted by human body is in the infrared region, mainly at the wavelength of 12 micron.
What are the source of radiation in microwave spectrometer?
The microwave spectrum results from interaction of the electric dipole moment with electromagnetic field of the microwave radiation.
How are microwaves produced physics?
Microwaves are produced by vacuum tubes devices that operate on the ballistic motion of electron controlled by magnetic or electric fields.
What absorbs microwave radiation?
Electromagnetic radiation, such as microwaves, are all the time reflected, transmitted, and/or absorbed by any kind of matter, glasses, conductors, water, ferrites, and so forth. Magnetic materials absorb greatly microwaves. The more magnetic, the more microwaves are absorbed.
Is a microwave radiation or convection?
Microwaves use radiation as the method of heat transfer. Radiation refers to heat transfer via electromagnetic waves, such as microwaves. Conduction is heat transfer via direct contact between two objects. Convection is heat transfer via the movement of surrounding fluids.
How do you detect microwave radiation?
Currently, microwave power can be detected using a device called bolometer. A bolometer usually consists of three materials: Electromagnetic absorption material, a material that converts electromagnetic waves into heat, and a material that converts the generated heat into electrical resistance.
