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Electromagnetic Waves
• Electromagnetic wave is a wave that can travel through empty space or through matter and is produced by charged particles that are in motion.
• Electromagnetic waves have two parts- an electric field and a magnetic field.
Electric Field
• Electric Field around an electric charge extends out through space, exerting forces on other particles.
Magnetic Field
• Magnetic field cause other magnets to line up along the direction of the magnetic field.
Electromagnetic Spectrum
• The range of electromagnetic waves with different frequencies and wavelengths forms.
Radio Waves
• Radio wave have the lowest frequencies of all electromagnetic waves and carry the least energy.
• Radio waves have wavelengths longer than about 0.3 meters.
Radio Waves
• Microwaves have higher frequency and shorter wavelengths than the wave that are used in you home radio.
Infrared Waves
• The waves have wavelengths between about one thousandth and 0.7 millionths of a meter.
Ultraviolet Radiation
• Ultraviolet radiation is higher in frequency than visible light and has even shorter wavelengths.
• These waves range between 0.4 millionths and about ten billionths of a meter.
X-Rays
• X-Rays have an even higher frequency than ultraviolet rays and have enough energy to go right through skin.