Electromagnetic waves

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• The electromagnetic spectrum includes waves such as white light, microwaves, and gamma rays.
• Electromagnetic waves are transverse waves that transfer energy from the source of the waves to an absorber.
• Visible light is an example of an electromagnetic wave.
• When white light passes through a prism, it splits into a spectrum with each color of light having a different wavelength and frequency.
• The order of wavelength and frequency on the red end of the spectrum is: lower frequency, longer wavelength; higher frequency, shorter wavelength.
• Visible light is the only part of the electromagnetic spectrum that can be detected by the human eye.
• The electromagnetic spectrum includes radio waves, microwaves, infrared, visible light, ultraviolet light, x-rays, and gamma rays.
• The frequency increases from radio waves to gamma rays and the wavelength decreases from radio waves to gamma rays.
• The electromagnetic spectrum is a continuous spectrum, meaning that the cutoff point between one type of wave and another is not always clear.
• Electromagnetic waves do not need a medium to travel, meaning they can travel through a vacuum.
• All electromagnetic waves travel at the same speed in a vacuum, which is 3 times 10 to the power of 8 meters per second.
• Different materials absorb, transmit, or reflect electromagnetic waves, and the outcome depends on the wavelength.
• Microwaves are absorbed by foods which contain water molecules, but are reflected from metals.
• Light waves are absorbed by black surfaces and reflected from shiny metallic surfaces.
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