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Amazon.com: Emergency Hand Crank Radio with LED Flashlight for Emergency, AM/FM NOAA Portable Weather Radio with 2000mAh Power Bank Phone Charger, USB Charged & Solar Power for Camping, Emergency : Electronics
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Radio Waves Used for communications Energy: Low energy Wavelength: a few cm to a few km Frequency: 10 2 Hz to 10 8 Hz Dangerousness: Not dangerous. - ppt download
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