That depends on what range of wavelengths (frequencies) you want to detect.
It's almost impossible to build a detector that responds to all wavelengths, so
you select the band you're interested in, and build a detector optimized for that
range of the spectrum.
Here are a few examples of detectors, by wavelength:
-- very longest, down to 1 millimeter . . . . . a radio receiver
-- 1 millimeter down to 750 nanometers . . . . . absorbent material and a thermometer
-- 750 nanometers down to 350 nanometers . . . . . your eyes, camera, photo-film, etc
-- 350 nanometers down to 10 nanometers . . . . . ultraviolet techniques
-- 10 nanometers down to 0.01 nanometer . . . . . X-ray film or crystallography
-- less than 0.01 nanometer . . . . . photomultipliers detect light produced
when gamma rays impact crystalline material.
Some part of the electromagnetic spectrum is dangerous, but not all of it in general. Radio waves, Visible light, and Infrared waves are harmless. An extremely long exposure to Microwaves can be a little bad to your health. Ultraviolet waves can cause sunburn. Exposure to X-rays can be bad. Its the gamma rays that you need to worry about because they are deadly. That's only one part of the electromagnetic spectrum so there really is nothing to worry about. Only if you are in outer space. So again, some part of the electromagnetic spectrum is dangerous.
When copper is used as a wire to build a coil with a lot of whorls and a piece of iron is inserted in the hole of the coil this is called an electromagnetic device since that a voltage is applied in the coil, thus generating an electromagnetic power which is similar to that natural magnetic iron.
Electromagnetic crane is used in a scrap yard please pick me as your answer
There's information to be learned from every part of the spectrum. That's why we build radio telescopes on Earth, and outfit artificial satellites with instruments to observe the parts of the spectrum that don't penetrate the atmosphere, like X-rays.
No (apex)
The UV rays of the sun are a part of the electromagnetic spectrum. These are high energy radiations. They build and destroy ozone both.
We detect electromagnetic radiation in a narrow band of frequencies that we call "visible light" with our eyes. We can feel a broader spectrum of electromagnetic radiation that we call "heat". (There are some overlaps.) We can build tools that detect ANY frequency of electromagnetic radiation, and display that in any format we select.
Here is are some simple instuctions on how to build an electromagnetic fishing pole... ... http://www.eweek.org/media/PDFs/elementary/Electromagnetic%20Fishing%20Pole.pdf
Some part of the electromagnetic spectrum is dangerous, but not all of it in general. Radio waves, Visible light, and Infrared waves are harmless. An extremely long exposure to Microwaves can be a little bad to your health. Ultraviolet waves can cause sunburn. Exposure to X-rays can be bad. Its the gamma rays that you need to worry about because they are deadly. That's only one part of the electromagnetic spectrum so there really is nothing to worry about. Only if you are in outer space. So again, some part of the electromagnetic spectrum is dangerous.
When copper is used as a wire to build a coil with a lot of whorls and a piece of iron is inserted in the hole of the coil this is called an electromagnetic device since that a voltage is applied in the coil, thus generating an electromagnetic power which is similar to that natural magnetic iron.
Electromagnetic crane is used in a scrap yard please pick me as your answer
im in south Africa trying to make an electromagnetic trian through using magnets from car speakers and trying to them repell
Build simple electroscope - discharge time can show humidity and ionisation situation
Carbon monoxide detector
You can build a metal detector using an AM radio and Calculator.But it is not sure that it will work or not.My brother had made metal detector using an AM radio and calculator two months ago,first it doesn't work at all but than he made some changes than it began working.Gurjot Singh Sodhi
Almost no natural products are used in building aircraft
it is better to use natural materials