"What if you take away the string? In that case, you'd look like a sad human shaking hands with an imaginary friend. Without the string, there's no wave. Waves need something to "wave" in-they need a medium. You can't have ocean waves without water. You can't have sound waves in space, since there's no air for them to ripple through. But what if, instead of string, you shook an electric charge (like an electron) up and down? Electric charges create electric fields, so this m"
Radio broadcasting did not disappear with television; radio signals continued to carry content, and radio remains embedded in everyday technology. Music streaming, GPS, and home Wi‑Fi rely on radio waves transmitted from cell towers and other devices. Radio waves are electromagnetic radiation like visible light, but they sit at the low end of the spectrum, making them low energy and generally harmless to humans. Low frequency supports wireless communication because radio waves can travel long distances and pass through obstacles such as walls. Waves transfer energy without transferring matter, and they require a medium. Electromagnetic waves arise when electric charges move, creating electric fields that propagate through space.
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