Datang male nanny

Chapter 210
Seeing that everyone's attention was focused, Ni Tu cleared his throat again.

"Everyone thought about two issues just now. One is the debate between two children, and the other is the chicken-and-egg problem. Let's ignore them for now. Let's think about these two issues first."

Ni Tu tapped the blackboard with a bamboo pole, first pointed to the two patterns on the left, and asked: "Everyone, please look at these two sets of patterns, which are a central circle and six surrounding circles. What is the difference between the two patterns?" , the most central circle, which one is bigger and which one is smaller?"

As soon as Ni Tu finished speaking, the people in the tavern started making noises.

"Of course, the second central circle is larger. Is there any need to ask? Can't you see it clearly and compare it with a single glance?"

Everyone shouted and shouted to express their support for this point of view.

Only the old man with the goatee thought there was something strange about it, so he didn't dare to jump to conclusions.

Ni Tu looked at everyone's confident and contemptuous eyes, and asked the goatee old man: "Dare to ask the teacher, which one do you think is big and which is small?"

"The old man thinks the second center is bigger!"

The old man with the goatee had the same opinion as everyone else, which made everyone very comfortable, and they all said that the old man's judgment was correct.

Ni Tu was noncommittal, and began to point to the second pattern with a bamboo pole and asked: "These two patterns are two water cups. If the water cups are all filled with water, which cup holds more water?"

One person took the lead to answer: "Of course it's the taller one at the back. Look at how much taller it is than the first one!"

Everyone agreed again.

However, at this time, the old man hesitated a little, guessing that the young man was able to take the trouble to draw it, there must be something strange, and it implied a big truth in it.

The old man frowned and began to think deeply.

"Master, what's your opinion?"

The old man twirled his beard and said slowly: "The old man is cautious, and it is inconvenient to answer, so I ask Shaojun to give the answer."

This is what Ni Tu wanted.

He nodded, picked up the teacup on the table, and said to everyone: "I drew these two circles with the teacup. Everyone, please watch the moment of miracle."

As Ni Tu said, he put the teacup on the center point of the second pattern, and traced the pattern on the blackboard with one finger: "Look, everyone, the center circle is drawn with this teacup. It's the same size."

"Everyone look here again!"

Ni Tu directly dragged the teacup to the center of the first pattern.

"What! The size is the same!"

"How is this possible! The first central circle is so small!"

The people in the hall were like boiling water, discussing one after another.

Xue Sanniang also widened her eyes just like them, looking at Ni Tu more and more fascinated.

Zhen Zhen'er on the side didn't take it seriously because she witnessed the astonishing scene just now, she folded her arms, chewed the tea stems in her mouth, and looked at the shocked eyes of everyone, very proud.

The old man with the goatee yelled, and said: "Confused, confused! This is like a person who stands between brothers and can stand out from the crowd, but if a person stands in front of a high mountain, he is as small as a bean. But the person is still the same person, but the reference object is different. That's all!"

After the old man said this, everyone suddenly realized.

It turns out that this illusion is due to different reference objects.

Ni Tu nodded to the old man very satisfied.

The old man with the goatee pondered for a while, and asked, "My little friend, is there any reason for the water glass in the back?"

Before Ni Tu could answer, someone asked loudly: "Yes, is there any pitfall?"

Everyone burst into laughter when they heard such straightforward words.

Ni Tu took two bamboo tubes with a smile, showed everyone that the inside of the bamboo tubes was hollow, and then put them in front of the blackboard, indicating that the two patterns were drawn according to the two bamboo tubes.

Then put the two bamboo tubes on the table, pick up the water bottle on the side and fill the chunky bamboo tubes.

Put down the kettle, carefully pinch the chunky bamboo tube, and walk a few steps in the crowd to show everyone that the water in the bamboo tube has been filled.

Everyone stretched their necks and saw that there was nothing strange inside, so they nodded one after another.

Afterwards, Ni Tu guarded everyone and slowly poured the water from the short and fat bamboo tube into the tall and thin bamboo tube, and then carefully handed it to everyone.

"Ah? It's also flush and overflowing! Doesn't this... mean that the two water glasses hold the same amount of water?"

The frying pan started again on the spot.

A boy was not convinced, and said loudly: "Let me try!"

Ni Tu put two water glasses on the man's table.

The man smoothed his sleeves, squeezed the wooden bucket containing the tea and drank it dry, then shook the water inside clean.

At this moment, everyone got up and gathered in front of this man's table to test the water volume.

They all stared tightly, for fear that they might miss something in a blink of an eye.

As a result, several consecutive experiments showed that the capacities of the two barrels were equal.

"This... what kind of reason is this?"

Ni Tu on the podium laughed, and said, "This is actually a trick."

"Blindfolding? What is blindfolding?"

"The method of blocking or diverting other people's sight is also a method of hindering or confusing vision. By placing objects in different environments to create the illusion of size, it will affect people's judgment."

The hand of the gray-bearded old man stroking his beard suddenly stopped, and he asked in surprise: "Could it be that this is the reason why the two children argue about the sun?"

Ni Tu smiled and nodded, and replied: "What the teacher said is very true, it is exactly the truth!"

The people at the scene suddenly started talking.

"But the sunrise in the morning is indeed huge!"

Ni Tu tapped the blackboard with a bamboo pole and said, "The second central circle is indeed very big, but they both have the same size."

The crowd was speechless.

Seeing that the time was ripe, Ni Tu said: "'The sun rises as big as a car cover at the beginning of the day, and it looks like a pan at midday'. This is due to the visual error caused by human eyes touching objects. Just like the two identical figures on the blackboard. If you put one of the central circles in several large circles and the other in several small circles, you can see that the former is small and the latter is large. The principles of the two are the same.”

Ni Tu originally wanted to explain the "light penetration" effect of physics, and the white graphics he saw were always larger than the black graphics of the same size, but he still dispelled the premise of having physical knowledge.

"When the sun rises and sets, there is only a corner of the sky on the horizon, and there are trees and houses in the background. In addition, the surrounding sky is dark at this time, so the sun is very bright and big; at noon, the background is the vast sky. , there is no object to compare with it, and the surrounding sky is already very bright, which is not too different from the brightness of the sun, so the sun appears smaller."

"As for the feeling of warmth and coldness, everyone knows that there are clouds, whether white clouds or dark clouds are visible, but there are also invisible clouds that are wind."

Ni Tu can only use this well-understood wind to explain the atmosphere.

Everyone thought that even if it was a scorching hot day, standing on a high mountain with the wind howling, they felt that what the boy said was true.

"The heat of the ground is the direct heat source of the clouds and high-altitude wind, and the size of the ground radiant energy is related to the amount of solar radiant energy received by the ground. In the morning, the sun rises, the horizon height is small, and the sunlight obliquely shines on the ground. The absorbed solar radiation energy is less, and the temperature is lower, so it is still 'cool and cool'."

"At noon, the sun shines directly on the ground, the solar radiation energy absorbed by the unit area of ​​the ground increases, and the temperature is high, so 'the sun is like exploring soup'. This principle is like the cold winter, when everyone enters the room from the cold wind, the When a hot cup is handed to you, you don’t feel hot at first. If you’ve been in a warm room before, and you find it unbearable to have a hot cup, it’s the same reason.”

Everyone thought about it, and nodded in agreement.

Ni Tu made a conclusion along the way: "Therefore, it is wrong to infer the distance of the sun from 'the distant one is small and the near one is big' or 'the near one is hot and the far one is cool'."

The old man with the goatee said loudly: 'Wonderful! '

After everyone came to their senses, they even shouted at the same time: "Okay!"

"Okay!" Even Xue Sanniang shouted and applauded happily.

There was thunderous applause and the atmosphere was very warm.

(End of this chapter)