But, remember how we said that some light is "invisible" to the human eye? Well, to detect this type of radiation, we need different detectors to be able to "see" the radiation. X-ray machines, radios, cell phones, and even your television (unless you have cable) are all types of light detectors.
|Movies About Light|
|Do you want to see a cool movie about light? Check this out!||light movie (4.9 MB)|
|To download Quick Time Movie Player, click here...|
|Type of Light Wave||Description of Light|
Range: 1000 meters to 1 cm
Radio waves are found at the longest wavelengths on the electromagnetic spectrum. These are the lightwaves that are used to send signals to your AM/FM Radio or your television (unless you have cable).
Range: one-tenth of a mm to 1 cm
Microwaves are used in radar and also in your microwave appliance at home that you use for heating food
Infrared RadiationInfrared radiation is what we like to describe as heat. We can't see infrared waves, but we can feel them. Your body gives off heat, so it is an emitter of infrared radiation.
The range of infrared wavelengths is about sub-millimeters to micrometers (the size of a bacteria).
Want to see a demo you can do with infrared radiation? Click here...
The range of visible wavelengths is 400 to 700 nanometers.
Ultraviolet light is the radiation from the sun that causes a sunburn when you have been outside too long
on a sunny day. But, watch out! You can't see ultra-violet light, so you can still get sunburned on a cloudy day.
X-rays are very energetic, and are used in X-ray machines to take pictures of your bones.
The range for X-rays is 10-10 to 10-12 meters.
|Gamma rays are the most energetic light waves found on the electromagnetic spectrum. We can find Gamma rays released in nuclear reactions and particle collisions. The range for a gamma ray is in picometers (10-12 meters).|
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