Chapter 574 Witness the Miracle! (Part 3)_3

This way, it’s undoubtedly much clearer and more accurate than observing with the naked eye.

In a certain sense.

This is also the most fascinating aspect of physics as a discipline.

Sometimes you don’t need equipment precise to the scale of femtometers or nanometers; the idea is the most important.

Like when Xu Yun was in school, there was an experiment that required simulating the oscillation of spider silk, but at the time, they couldn’t find equipment with a suitable oscillation period.

As a result, a tomboy pulled out an X stick and a protective X device on the spot and perfectly simulated the necessary period data through a foam pad.

That incident became a legend at Ke Da, and even during reunions, Xu Yun and his classmates still talked about it.

Of course.

Xu Yun and his friends never really clarified one thing with that girl—later, they thought, actually using an electric razor would be about the same...

Ahem, back to the point.

The thought process is clear, and the rest is very simple.

Xu Yun kept the generator in a state of activation and distributed several detectors prepared by William Whewell to the group to detect the standing waves.

"The voltmeter here reads 0; it’s a zero point!"

"1.7V... Is there anyone bigger?"

"...I guess not, 1.7 seems to be the position of the crest and trough."

"1.5...1.6....1.7, found it, here’s a peak zone!"

The voices of all the bosses rose and fell within the room, and soon, the intervals of several standing waves were detected.

"0.26 meters....."

Looking at the statistically compared values, Faraday rubbed his chin:

"The distance between the two points of destructive interference in the standing wave is half the wavelength, or nλ/2, so calculating it this way, the wavelength of the electromagnetic wave is..."

"6.5×10^-7m?"

Xu Yun nodded.

The main spectral lines of the photoelectric effect actually have two, one is 6.5×10^-7m, and the other is 4.8×10^-7m.

These scales, after being amplified by standing waves, can easily be measured in the macroscopic world.

In other words...

Xu Yun really ’captured’ the electromagnetic wave!

Looking at the values on the paper, then at the detector in hand.

Faraday, while feeling shocked and admiring, couldn’t help but feel a bit discouraged and melancholic:

Although he long knew he couldn’t compare to Mr. Feiyu, he never expected the gap between himself and Mr. Feiyu to be so vast...

This experiment casually designed by Mr. Feiyu is probably enough for everyone present to reminisce for a lifetime.

Not to mention, according to Xu Yun.

This is just one of the experiments designed by Mr. Feiyu.

Indeed a person capable of being mentioned alongside Sir Newton...

In any case.

With things at this stage, the next steps are very simple.

In those days, Hertz had not yet proposed the unit of frequency... that is, the concept of Hertz.

But the spectrum thing was invented as early as the time of Little Niu, only its definition was still relatively close to ’period’.

The generator designed by Xu Yun is equivalent to an oscillating dipole, which during operation induces high-frequency oscillations, and the induction coil charges at a frequency of 10-100 per second, producing a damped oscillation graph. (I’ll try to upload it to this Chapter if possible, but the review process for this Chapter is a bit frustrating)

Knowing the number of turns and the power, calculating the period becomes quite easy.

Therefore, very soon.

The values of the wavelength and oscillation period were presented before Faraday and others.

Faraday gazed at the values for a long time, then picked up a pen and began calculating.

The frequency of electromagnetic waves is the same as the oscillation frequency of the wave source, and the wavelength is related to the refractive index of the medium.

Although the refractive index in air is slightly different from in a vacuum, for people in 1850, this error is basically negligible.

Rustle, rustle, rustle——

Faraday’s pen tip moved steadily and swiftly across the paper.

Despite his not-so-good math skills, he felt somewhat overwhelmed by the current amount of calculations.

A few minutes later.

Faraday finally finished calculating the last digit.

As he was about to take a light breath of relief, his eyebrows furrowed instinctively once more.

For some reason.

He always felt that this number on the paper seemed somewhat familiar?

Seeing Faraday’s hesitant expression, nearby Wheat could hardly contain himself, his thirst for knowledge rivaling even Little Niu’s.

He curiously approached to glance at the result, then suddenly uttered a slight "ah":

"2.97969X10^8m/s, isn’t this...."

"Light speed?!"

.......