Can radio antennas emit visible light?
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No, radio antennas cannot emit visible light. Radio antennas are designed specifically to transmit and receive radio waves, which have much longer wavelengths compared to visible light. Visible light ranges from approximately 400 to 700 nanometers in wavelength, while radio waves can range from millimeters to meters in wavelength.
If you pump enough energy into a radio antenna, you can heat it up until it glows and emits visible light through the process of thermal radiation. However, a regular radio antenna cannot emit visible light that carries information, similar to how it does with radio waves.