Chapter 571 - 260: Electromagnetic Waves Are Light?_3

Oh, so even Mr. Fat Fish can make mistakes...

Perspective.jpg.

Of course.

At this moment, Faraday had no idea what Xu Yun was thinking.

After hearing Xu Yun’s explanation, he just felt a faint trace of strangeness, barely perceptible, but quickly accepted the explanation.

After all, based on current observations, there really isn’t any obvious difference between light and electromagnetic waves.

Then Xu Yun and Faraday used polarizers and other devices to further verify the properties of electromagnetic waves, discovering that, similarly, it exhibited refraction, reflection, and polarization.

At this point, all that was left was to wrap things up.

Faraday took out a sheet of parchment and wrote down the final conclusion:

[After verification, electromagnetic waves are a special kind of light].

Following that, Faraday and the rest recapped the experiment’s results, getting ready to officially present the findings at the next academic conference.

Thus.

The very first "spectacular show" Xu Yun pulled off at the University of Cambridge finally ended with a full stop.

He figured that from now on, there probably wouldn’t be anything more exciting than this....

Right?

With Faraday and Joule Kirchhoff already showing up, Xu Yun really couldn’t imagine what could top this kind of commotion....

Yeah, absolutely impossible!

If there is, he’d eat the axe on the spot again!

Half an hour later.

Xu Yun, done packing up the experimental gear, went back to Dorm 302 with Maxwell tagging along.

As soon as he entered the room.

Xu Yun unwrapped his scarf and flopped back onto the bed.

To tell the truth.

The past two days of experiments looked pretty smooth on the surface, but for Xu Yun, the pressure on his shoulders was anything but small.

After all, even the tiniest slip in any part of the process could have caused an irreversible impact on the results.

Fortunately, relying on all the "good karma" he’d accumulated from consistent web novel updates in his past life, he managed to clear this hurdle smoothly.

Just as Xu Yun was lying back on the bed.

A long-lost light screen suddenly reappeared in front of him.

[Wallfacer’s first chain mission complete, evaluating mission and generating second chain mission.....]

.....

Note:

The gaokao results are out, has anyone reported their score?

V=1/√μ0ε0. Here, μ0 is the absolute magnetic permeability, valued at 4π×10^-7 m·kg/C2. ε0 is the vacuum permittivity, valued at 8.854187818×10^-12 C2s2/kg·m3. The former can also be expressed as N/A2, and the latter as F/m. But in normal history, whether it’s Faraday or Ampere, these units weren’t formally defined until the 1881 International Electrical Congress. But as with the curl, the concept was already well understood by the scientific community as early as 1850—it’s just that the way they wrote the units was still C2s2/kg·m3 for the time being. Just like the unit coulomb for electric charge, also defined at that 1881 conference—long before that, people were using it as if it were nothing. The reason the 1881 conference was held, mainly, was because countries in America and Asia didn’t have a complete system yet on this front, so the congress officially defined the units. The Asian country mainly refers to Neon (Japan), related to the Meiji Restoration, but I won’t go into details here. By the way, at that conference they defined seven electrical measurement units: coulomb, ampere, volt, ohm, farad, henry, and siemens. Of course, after reading this, some classmates might ask: at the technological level of 1850, how did they even measure those numbers in vacuum? That’s a bit like a question a reader asked back when I (Xu Yun) wrote novels in my past life—’Could they really get such precise numbers in 1850?’ The root cause of both questions is the inherent knowledge barrier—a lot of people think 1850 and now are as different as two epochs, like figuring out 10x10=100 would already be a huge deal back then. But that’s actually a total misconception. In fact, 1850 was already near the threshold of modern science. In this period, a lot of fields weren’t as primitive as people imagine. Take vacuum measurement, for example. Way back in 1643, Galileo’s student Torricelli invented the first device for measuring gas pressure. Through experiments, he confirmed that atmospheric pressure equaled a 760 mm mercury column...or 7.6×10^4 Pa, becoming a pioneer in quantitative vacuum measurement. And before 1850, Borden—the big shot who invented the Borden tube—even came up with the deformable vacuum gauge. Otherwise, how else do you think Maxwell managed to deduce the speed of light in vacuum from the Maxwell equations? Sure, there’s a huge gap between 1850 and 2022—that’s beyond question. But that doesn’t mean that era was basically the Stone Age and had nothing to offer. It’s just like web novels nowadays; in 2022 we got more than a few works with over 100,000 average subscriptions—a figure unimaginable in 2012, when top works only had ten or twenty thousand at most. But can you really say web novels from 2012 had nothing going for them? Obviously not. Works like "Heavenly Cover", "Devouring", "Eternal Life", and "Mortal"—even viewed from 2022’s perspective—are still bona fide classics. Every era has its own limitations, but it also has its highlights. Back to reality. Having thought of V=1/√μ0ε0, the next step is pretty straightforward. "V=1/√(4π×10^-7m·kg/C2 × 8.854187818×10^-12C2s2/kg·m3...." Such a complicated calculation, so naturally Maxwell is in charge: "So, V=√(8.987552x10^16 m2/s2)...""Final answer is 2.9979×10^8 m/s!" Maxwell’s result is the speed of light in vacuum. Since Xu Yun and the others’ measurements inevitably had some error, it’s normal for the decimal points to differ a little. "2.9979×10^8 m/s..." Faraday repeated the number, marveling to himself, when another idea popped unexpectedly into his mind: If I want to keep teaching long-term at the University of Cambridge, I’ll probably need to regularly ask Prince Albert for some nitroglycerin.....Then he took a deep breath, looked at Xu Yun, and asked, "Luo Feng, does this mean that light and electromagnetic waves are the same thing?" Xu Yun nodded decisively, about to say something else, but swallowed it back at the last second. In that instant, countless thoughts flickered through his mind. He hesitated briefly, and changed what he’d been about to say: "Yes, Mr. Faraday, according to the research of Fat Fish’s ancestors back in the day, the final conclusion was this." "That is, electromagnetic waves are light at a particular frequency." Anyone who’s passed Physics 2 in high school knows: light is actually a type of electromagnetic wave, a proper subset. In plain terms, within a certain frequency—or rather, wavelength—range, electromagnetic waves are what we call light. Like humans are just a part of the primate order: if you compare humans to light, then electromagnetic waves are all primates. Of course, this is just the basics—it gets way more complicated if you go deeper. For example, you could say electromagnetic waves don’t need a medium to propagate, or say space-time itself is the medium—like spatiotemporal waves in string theory. So the curvature of space-time due to gravity can affect light, and some people even believe that the aether people searched for is just space-time itself, etc.....Especially some amateur scientists who are obsessed with having all kinds of weird hot takes in this area. I heard someone even emailed the Academy last year, asking to visit the tokamak for observation...For most people it’s ’hear the Dao in the morning, die at night and have no regrets’; this guy is ’hear the Dao in the morning, die instantly’...