WEBVTT

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[unclear opening audio]

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Huh, so the internet comes in through here

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and then moves wirelessly to the laptop.

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But if it's not using wires, what does it use?

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Electromagnetic energy.

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Oh, hello. Who are you?

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My name is Heinrich Hertz.

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Oh, I know about Hertz. Hertz is how many times something happens per second.

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Yes, Hertz is a unit of measure that was named after me.

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But my true passion is inquiring into the nature of electromagnetic energy.

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And that's what the internet uses to get to my laptop?

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Ja, natürlich! Wi-Fi sends data over radio waves, which are in fact

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electromagnetic energy.

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Radio waves? Like my little FM radio?

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Yes, but electromagnetic waves aren't just used to transmit sound.

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They do so many other things, you know. They're all around us every day.

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Imagine if we could see all of them?

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Well, it might look something like this.

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Waves with different frequencies are used for different things.

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What kind of different things?

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Well, you see, waves of electromagnetic energy that change somewhat slowly are known as radio waves.

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We use radio waves to send sound and data without wires.

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Waves that change at a faster rate are called infrared.

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We use these to control our televisions and so many other different things.

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And waves that move faster than infrared are known as visible light.

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Why?

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Yeah, it's true. The light we see with our eyes is made of electromagnetic energy.

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So we see electromagnetic energy all the time. Very cool.

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Yeah, electromagnetic energy at any frequency is an astonishing thing.

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Wow, so when something is wireless, it uses electromagnetic energy instead

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of wires.

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I guess that answers my question. Thanks for your help Mr. Hertz.

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Oh, Mr. Hertz, where'd he go?