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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Amazon.com: Emergency Crank Radio with 2000mAh Emergency Power Bank, AM/FM NOAA Solar Powered Crank Wind Up Radio with SOS Alarm, Bright Flashlight, Emergency Power Bank for Cellphone, Used for Outdoor&Emergency : Electronics
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