"...The above are my views and suggestions."
"Sender, Li Feiyu."
After finishing this letter.
Xu Yun let out a gentle sigh and placed the pen aside.
Although it was still unclear why and through what channel this letter reached him.
But based on the situation previously ntioned by Little Niu in the letter.
Perhaps...
This is so sort of activation thod for outside assistance?
That is, when Little Niu encounters a problem he finds difficult to solve, there is a certain possibility that he can contact , engaging in cross-dungeon correspondence.
It's just unclear whether this thod has a fixed cycle, more crucially, it's uncertain...
Whether there is any reward?
After all, according to Halo's previous performance.
Although it can be sowhat stingy, it has always adhered to the basic principle of "no pain, no gain."
Xu Yun then turned his attention back to the letter, starting the final proofread.
The purpose for Little Niu writing this letter was actually very clear:
The core issue was that for so unknown reasons, he had developed so doubts about the particle theory of light.
Maybe it was so phenonon suggested by an outsider.
Maybe it was so clues that Little Niu discovered himself.
In any case, the impact on Little Niu was considerable.
Therefore, in this reply.
After much deliberation, Xu Yun finally chose to ntion the wave-particle duality of light.
In the previous life, all friends who read textbooks would know.
The so-called wave-particle duality of light is actually very simple in textbook terms:
Light is both a wave and a particle.
In future generations, as long as you have received compulsory education, you would have co across this term.
But historically.
The exploration of the nature of light was actually a very tortuous affair.
Before Little Niu.
The wave theory of light actually had a lot of currency.
This theory was put forward by Huygens, and its number one fan was Hook, who was previously ntioned and greatly mistreated.
Hook supported the wave theory of light because he discovered the phenonon of light interference, which is the colorful soap bubbles we usually see.
These beautiful bubbles are actually thin-film interference of light, and interference is undoubtedly a characteristic of waves.
So naturally, Old Hu believed that light is a wave.
Later, Little Niu ventured into new territory, proposing the particle theory.
And with the growing prestige of the Duke, scientists ford the view of "two whatevers":
Whatever the Duke supported was right, whatever the Duke opposed was wrong.
Thus, the particle theory thrived while the wave theory declined.
Then ca a person nad Thomas Young who conducted an initial interference experint.
This experint has now entered middle school textbooks; its ingenious design is a classic in physics:
Place a piece of paper with a pinhole in front of a lit candle, obtaining a point light source.
Place another piece of paper with two narrow slits in front of the point light source.
Then on the screen behind this paper, you would see alternating light and dark fringes.
By adjusting the distances between the paper and the screen, and between the double slits, you could change the spacing of the interference fringes.
The importance of this experint ranks among the top in the history of science, so much so that when confirming electron wave properties later, scientists directly adopted the sa experintal principle.
Thus, the double-slit interference experint holds two spots among the ten classic physics experints.
By 1808.
Marius discovered the phenonon of light polarization.
Later, with the discovery of Poisson's spot, the wave theory of light saw a resurgence, achieving complete victory.
Then ca Faraday and Maxwell. In classical physics—that is, the world visible to our naked eyes—the definition of light basically stopped here.
After another 80 years, Hertz discovered electromagnetic waves.
The photoelectric effect.
This key dividing line between the macro and micro world in human history was discovered for the first ti.
During research on photoelectric effect, Thomson discovered the electron through the study of cathode rays.
At that ti, Thomson exclaid as if he saw sothing extrely surprising, that there existed such small things in the world!
Thus advancing human research into another micro world.
The subsequent developnts beca quite straightforward.
In 1900.
Planck proposed the quantum hypothesis.
In 1902.
Lenard summarized the photoelectric effect.
In 1905.
Lao Ai, Einstein entered the stage, summarizing the wave-particle duality of light.
After Lao Ai ca Lai Debro, who proposed the hypothesis of matter waves.
He pointed out that not only photons possess wave-particle duality, but all microscopic particles do.
In 1927.
Arican physicist Davidson, a year after de Broglie's paper was published, completed the electron diffraction experint.
Proving that electrons have wave properties, wave-particle duality as a basic characteristic of matter was confird, de Broglie's idea was vindicated.
Since then up to now, front-end physics has been primarily researching the truth behind the phenona observed by these sages.
anwhile.
The entire debate over the nature of light lasted for hundreds of years, requiring a large accumulation of accomplishnts.
Therefore, Xu Yun had no worry that his hints to Little Niu would steal Einstein's thunder, because in physics, proposing a concept doesn't equate to the truth.
Just like Little Niu's accomplishnts in the field of universal gravitation.
Before Little Niu, many had already discovered 'gravity' or 'gravitational' phenona, such as the famous official Xin Qing.
But discovering a phenonon ans nothing, further arguntation and calculations are the tough parts.
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