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KS3 Science - Electromagnetic Spectrum: Microwave

A guide to resources on electromagnetic waves, from radio to gamma - their use, danger and occurrence, compiled by your librarians.

Cosmic Microwave Background

 Credit: NASA/WMAP Science Team

Discovery

'Microwaves' were first produced and studied by Hertz in 1886. However, their practical application was realised only on creating suitable generators. 

Video on Microwaves

Microwave to Destroy Tumours

Sweetsearch

Sweetsearch a handy web search tool...

Properties of micro wave

Microwaves have wavelengths more than that of infrared waves, but less than that of radio waves.

Microwaves can penetrate clouds of smoke,haze, light rain and snow, hence used to transmit information.

The longer waves are used for heating our food, Shorter microwaves are used for mapping meteorologic disturbances and in weather forecasting. 

Microwave technology is highly efficient in converting electricity into MicroWaves and saves energy with rapid, in-depth heating of materials

Applications

In a Microwave oven, the waves generated are of a frequency that can be absorbed by the water and fat in the food. Microwave ovens are becoming a very popular means of heating and cooking food quickly. Check out here how a microwave oven works....

Radar is an application of microwave technology - to detect objects by transmitting short bursts of microwaves and measuring the strength and origin of "echoes" received from them.

That dirty motor oil that comes out of your car or truck engine during oil changes could end up in your fuel tank... read about new process for recycling waste crankcase oil into gasoline-like fuel 

More Applications of Microwaves....

Read about Risks and Dangers

" Beyond certain temperatures, microwaves can harm living tissue - hence prolonged exposure should be avoided "

"In extreme  cases, the chemical balance of the brain can be upset if the frequencies equal the brain wave frequencies. "

What do studies reveal about the above two statements ? Read more from the links below...

Did you know??

Did you know that if you had a sensitive microwave telescope in your house that you would detect a faint signal leaking out of your microwave oven, and from various other man-made sources, but also a faint signal coming from all directions that you pointed it? This is the Cosmic Microwave Background!

source: http://science.hq.nasa.gov/kids/imagers/ems/micro.html