Chapter 551 255: At Kang Bridge, Waving Sleeves to Summon a Dark Cloud (Part 2)_2

In summary.

In the inherent conceptions of Faraday and the others.

Whether a spark appears on the receiver must be positively correlated with the intensity of light and has nothing to do with frequency.

Xu Yun didn't explain much about this but waited for Old Tang to finish debugging the nonlinear optical crystal.

Ten minutes later.

Old Tang gestured to Xu Yun and said:

"Luo Feng, the crystal has been fixed according to your requirements."

Xu Yun thanked him and invited Faraday and the others to come to the isolated equipment.

At this time, the nonlinear optical crystal was already mounted at the refraction point of the reflective zinc plate and could be rotated as needed.

Xu Yun first went to one side of the fixed optical crystal and made minor adjustments and corrections according to the marks above to ensure that the light could be refracted smoothly to the receiver.

A little over a minute later.

Xu Yun stood up and said to Faraday:

"Professor Faraday, the crystal is now debugged, and everything is normal with the circuit."

"The refracted light you will see next will be orange light with a wavelength of 590 to 625 x 10^-9 meters."

The specific data of light's wavelength was calculated by Thomas Young as early as 1807, but it wasn't until 1959 that the unit nano was proposed by Chad Feynman.

Therefore, at this time, the description of light's wavelength measurement was still expressed in powers of ten negative meters.

Besides, any student whose physics teacher hasn't died of anger should know.

The longer the wavelength of light, the higher its frequency.

Red, Orange, Yellow, Green, Blue, Indigo, Violet.

The wavelength gradually decreases from left to right, and the frequency increases in turn.

Although Lafayette still couldn't figure out why Xu Yun was obsessed with light frequency, he nodded cooperatively:

"I remember, continue, Luo Feng, my classmate."

Xu Yun then returned to the transmitter side and pressed the start button.

Whizz—

The voltage began rising from zero again.

1 volt....

100 volts....

300 volts.....

1000 volts.....

However, to Faraday and the others' surprise.

When the voltage rose to twenty thousand volts for the first time, a routine spark appeared on the generator, but on the generator it was.....

Absolutely no movement.

Soon, the voltage rose again.

22,000 volts...

23,000 volts...

As is well known.

The intensity of light is related to power, and when resistance is unchanged, power is related to voltage.

That is, p=u·u/R, the higher the voltage, the higher the power.

However, when the generator's voltage increased to 28,000 volts, there was still no spark on the receiver.

Seeing the expressions of Faraday and the others gradually becoming solemn, Xu Yun gestured to Wheat.

Soon.

Wheat came up with a convex lens.

Friends who have transformed into Ultraman Tiga should know.

Under normal circumstances, there are really only three principles for increasing light intensity:

Reducing the beam solid angle, reducing the spot size, or increasing the energy of the light.

Among them, the convex lens is an extended application of the first principle.

That is, it gathers the light through refraction more finely, condensing the scattered light into a bunch, thereby achieving the effect of increasing light intensity.

Afterward, Xu Yun took the convex lens from Wheat's hand, set it up on a device similar to a later live broadcast stand, and moved it in front of the reflective plate.

Under the focusing effect of the convex lens,

the light splattering from the spark on the generator was gathered into a small strip, and the intensity was again effectively improved.

If converted into pure power, the light splattered out was approximately equivalent to an effect of around fifty thousand volts of voltage.

Yet...

The reflective board still looked as empty as when Xian Weiren was doing college physics problems, with nothing on it.

Seeing this situation.

Lafayette, who originally thought there would be no more surprises, couldn't help but feel unsteady.

He quickly walked to the side of the reflective plate, wanting to check if the optical crystal refracted the light to another direction.

Yet no matter how he adjusted the crystal, there was still no spark on the receiver.

But.....

How could this be?

Could it be that the spark on the receiver requires a certain probability or period to appear?

But during Xu Yun's demonstration just now, the flicker pattern of the spark on the receiver was completely consistent with that on the generator.....

Moreover, there have been no fewer than thirty sparks on the generator; no matter how unlucky.....

Uh, wait a minute?

Suddenly, Faraday thought of something, his gaze subtly glancing at Tatum Austin in the crowd.

Could it be due to this black classmate, who is clamoring to plant watermelon and cotton?

If memory serves.

This black classmate is from Mozambique and is the next chieftain of the tribe, hence received a good basic education...

And just as Faraday's mind was wandering.

Xu Yun, estimating that the time was about right, had Wheat remove the convex lens.

He turned off the power and started debugging the optical crystal again.

This time he chose another naturally cascading crystal with a walk-off angle of about 40°.

As for phase matching, since readers don't know what it is... ahem, due to difficulty in measurement and time constraints, Xu Yun didn't calculate it in depth.

In any case, under these experimental conditions, a phase matching over 80% is sufficient.

In short, this crystal can reflect blue light, which is the wavelength of light between 440 and 485 nanometers.

After completing the adjustments.

Xu Yun once again returned to the generator side and pressed the switch.

The voltage still rose from zero.

After just over half a minute.

Clap!

A routine spark appeared on the generator, and to the breathless surprise of Lafayette and the others...