H is for Hertz

automatic captions, checked for structure and key terms; corrections welcome

[00:00:08.200] [unclear opening audio]
[00:00:36.600] Huh, so the internet comes in through here
[00:00:41.800] and then moves wirelessly to the laptop.
[00:00:47.320] But if it's not using wires, what does it use?
[00:00:52.360] Electromagnetic energy.
[00:00:53.780] Oh, hello. Who are you?
[00:00:57.180] My name is Heinrich Hertz.
[00:00:59.700] Oh, I know about Hertz. Hertz is how many times something happens per second.
[00:01:05.480] Yes, Hertz is a unit of measure that was named after me.
[00:01:09.440] But my true passion is inquiring into the nature of electromagnetic energy.
[00:01:15.400] And that's what the internet uses to get to my laptop?
[00:01:18.300] Ja, natürlich! Wi-Fi sends data over radio waves, which are in fact
[00:01:23.520] electromagnetic energy.
[00:01:25.600] Radio waves? Like my little FM radio?
[00:01:28.960] Yes, but electromagnetic waves aren't just used to transmit sound.
[00:01:33.960] They do so many other things, you know. They're all around us every day.
[00:01:39.200] Imagine if we could see all of them?
[00:01:42.100] Well, it might look something like this.
[00:02:02.940] Waves with different frequencies are used for different things.
[00:02:08.080] What kind of different things?
[00:02:11.000] Well, you see, waves of electromagnetic energy that change somewhat slowly are known as radio waves.
[00:02:23.440] We use radio waves to send sound and data without wires.
[00:02:30.940] Waves that change at a faster rate are called infrared.
[00:02:35.520] We use these to control our televisions and so many other different things.
[00:02:43.720] And waves that move faster than infrared are known as visible light.
[00:02:49.360] Why?
[00:02:50.560] Yeah, it's true. The light we see with our eyes is made of electromagnetic energy.
[00:02:56.700] So we see electromagnetic energy all the time. Very cool.
[00:03:02.440] Yeah, electromagnetic energy at any frequency is an astonishing thing.
[00:03:13.360] Wow, so when something is wireless, it uses electromagnetic energy instead
[00:03:19.320] of wires.
[00:03:20.220] I guess that answers my question. Thanks for your help Mr. Hertz.
[00:03:24.200] Oh, Mr. Hertz, where'd he go?