Quite simply, the Microwave Oven uses the Microwave part of the spectrum.
The radio frequency portion of the electromagnetic spectrum uses radio telescopes.
Gateway
The visible light portion of the electromagnetic spectrum would be used to study waves that humans can see. This portion of the spectrum includes colors ranging from red to violet and is the only part of the spectrum visible to the human eye.
Light with a wavelength of 489 nm falls within the blue region of the visible spectrum. It is part of the visible light spectrum. Light with a wavelength of 987 nm falls within the infrared region of the electromagnetic spectrum.
-- Because they can't be efficiently transmitted or collected, on account of the ridiculously humongous antenna size required. -- Because they're too strongly absorbed by atmospheric gases or water vapor. -- Because they can't be generated with currently available technology.
Visible light
The radio frequency portion of the electromagnetic spectrum uses radio telescopes.
Microwaves because we use them everyday
Gateway
The electromagnetic spectrum spans from the lowly radio signals (1x104 Hz) that we use for terrestrial broadcasting to gamma rays (1x1021 Hz) from the sun! ===================
They just use a harsher light in the electromagnetic spectrum.
It is very easy to use!
yes, yes they do :p
Some devices that involve electromagnetic waves that we can't see include microwave ovens (use microwaves), X-ray machines (use X-rays), and radio transmitters (use radio waves). These devices operate on different parts of the electromagnetic spectrum, beyond what is visible to the human eye.
Jobs that involve using the electromagnetic spectrum include telecommunications engineers, radio astronomers, radiologists, and remote sensing specialists. These professionals work with various parts of the EM spectrum to communicate, study celestial objects, conduct medical imaging, and gather information about the environment, respectively.
The visible light portion of the electromagnetic spectrum would be used to study waves that humans can see. This portion of the spectrum includes colors ranging from red to violet and is the only part of the spectrum visible to the human eye.
Light with a wavelength of 489 nm falls within the blue region of the visible spectrum. It is part of the visible light spectrum. Light with a wavelength of 987 nm falls within the infrared region of the electromagnetic spectrum.