The electromagnetic spectrum and its uses
The electromagnetic spectrum is the full range of electromagnetic waves, which all travel at the speed of light in a vacuum. In order of increasing frequency (and decreasing wavelength), it runs from radio waves to microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Each band has its own uses. Radio waves carry broadcasts, and radio telescopes collect radio waves from space to study objects that visible light cannot reveal. Microwaves carry cell phone and Wi-Fi signals, power radar, and heat food in microwave ovens. Infrared is used in remote controls and thermal cameras. X-rays pass through soft tissue but are absorbed more by bone, which makes medical X-ray images possible. Gamma rays are used in radiation therapy to destroy cancer cells and to sterilize medical equipment.
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