But you can't see people when you listen to the sound: in the process of wave propagation, when the size of obstacles is less than the wavelength, obvious diffraction can generally occur. The height of the fence is several meters, and the wavelength of sound waves is greater than the height of the fence, so you can surround the high wall and make people outside the wall hear it; The wavelength of light wave is shorter (about 10-6 meters), which is much smaller than the size of a high wall, so the light emitted by people cannot be diffracted outside the wall, and people outside the wall can't see people inside the wall.
One day in the cave has been a Millennium: according to Einstein's theory of relativity, sailing in a spaceship near the speed of light will lead to the passage of time much slower than on earth. If you live in this "cave" for a few days, the earth will have passed several years, decades, even hundreds and thousands of years. Sitting in a well and observing the sky, we can see very little: because light travels along a straight line, according to the knowledge of geometric drawing, the frog's field of vision will be very small. Before the jade is polished, the surface is uneven and the light is diffuse. After the jade is polished, the surface is smooth and the light is mirrored.
Before polishing, the jade surface is uneven and the light is diffuse. After polishing, the jade surface is smooth and the light is specular.
The bright moon is in the sky, and the bright moonlight shines on the calm lake. After reflection, it forms a beautiful reflection in the water, similar to flat mirror imaging. Moonlight enters the human eye through reflection, and only in this way can people see the reflection. People close to the water tower are most likely to receive these lights and enjoy the beautiful scenery of this beautiful night, while people far away from the water can't feast their eyes on them naturally, because the reflected light is blocked by pavilions.
Sunbathing flowers and trees in the sun, the surrounding temperature is high. Plants get more light energy from the sun, so they grow rapidly and have deep roots, and they are the first to know the information of spring. However, back-yang plants absorb less light energy, grow slowly, and the pace of spring comes later.
2. Poetry about physics 1. Mountain peaks float, no water, no mountains and no ecstasy. -Guilin landscape in modern Wu Mai.
Physical principles: reflection and refraction of light.
The mountains are stacked in the water, and there is a reflection of the mountains in the water. There is no unattractive mountain, no unattractive water.
Second, Hanshan Temple outside Gusu City, the midnight bell goes to the passenger ship. -Zhang Tang Ji "Sleeping in Fengjiang"
The spread of sound.
In the lonely and quiet Hanshan Temple outside Gusu, the bell rang to the passenger ship in the middle of the night.
Third, the green hills on both sides of the strait are opposite, and the sails are coming alone. -Tang Li Bai's "Looking at Tianmen Mountain"
Physical principle: Castle Peak is static relative to the ground, but with the moving ship as the reference, Castle Peak becomes moving, with the river bank as the reference, and the solitary sail comes from the sun.
The beautiful scenery of the green hills on both sides of the strait is inseparable, and a solitary boat comes from the horizon.
April, April, beautiful scenery on earth, peach blossoms in mountain temples. -Tang Bai Juyi's Peach Blossom in Dalin Temple
Physical principle: The higher the terrain, the slower the temperature rises. In the same season, the temperature on the mountain is lower than that on the mountain.
In April, all the flowers have withered, and the peach blossoms in the ancient temple in the mountains have just bloomed.
Verb (abbreviation of verb) How the water of the Yellow River flows out of heaven and into the ocean, which is gone forever. -Tang Li Bai's "Into the Wine"
Physical principle: water cycle.
The water of the Yellow River fell from the sky, and the waves rolled straight into the East China Sea, never to return.
3. Ancient poems with physical phenomena that I searched online:
1, one day in Jiangling: high moving speed.
2. The canoe has crossed Chung Shan Man: This poem is set in a mountain, and the ship is moving relative to the mountain.
Leaves fall like the spray of a waterfall: the leaves fall to the ground under the action of gravity.
4. And I watch the long river always rolling forward: the river flows to low-lying places under the action of gravity.
5. Qian Fan passed by the sunken ship: description of relative motion. Because his boat is not moving, the boat next to it is moving relative to itself.
6. How much sadness can you have, just like a river flowing eastward: in China, the east is lower than the west, and the river flows downwards under the action of gravity. . (Physics+Geography)
7. The moon rises on the sea, and the world ends * * * At this time: Because the moon is far from the earth, the moonlight shines in a wide range. . (Physics+Geography)
8. Reading with the sound of wind and rain, the sound is in the ear: 1, and the spread of sound will not interfere with each other; 2. Sound can spread around obstacles.
9. It snows in Tianshan Mountain in May, and there is no wind but cold. It shows that at high latitudes, the cold weather lasts for a long time because the sun receives less heat. (Physics+Geography)
10, grass withered eagle eye disease, light snow: grass yellow, animals can see the eagle in the sky more clearly because there is no camouflage of protective color. This is a phenomenon of light; Because there is no snow on the ground, the horse runs faster, which is a mechanical phenomenon.
1 1, until the war drums, which exploded from Yuyang, shook the whole earth and broke the tune of rainbow skirts and feather clothes: the previous sentence shows that the earth (solid) has stronger ability to spread sound than air.
12, I know from a distance that it is not snow, but it has a faint fragrance: it looks like snow (white), but by distinguishing the taste, I know the essence of matter, and the faint fragrance comes from the movement of molecules. (Physics+Chemistry)
13, even the sea level is in the spring tide, and the bright moon on the sea is born in the tide: the previous sentence means that due to the gravity of the earth, the water levels of rivers connecting the sea are at the same height as the sea level.
14, you have seen how the water of the Yellow River moves out of the sky and into the ocean, never to return: physical phenomena are the same as the sixth poem.
15, Hanshan Temple outside Gusu City, midnight bell to passenger ship: judge the object making sound according to the timbre of the sound.
16, you can draw a carved bow like a full moon, look northwest and shoot a Sirius: the full bow contains elastic potential energy.
17, Flying down the Three thousands of feet: Water falls from a height, including the transformation of gravitational potential energy and kinetic energy.
18, in August, the high wind roared, rolling my three hairs: the moving air (wind) has kinetic energy.
19, Chai Men smells dogs barking, and people go home in the snow at night: sound can transmit information, and people know that someone is back through dogs barking.
20. But after going up a flight of stairs, you can broaden your horizons by 300 miles: you can only see far if you climb high. (Physics+Geography)
Hehe, it took me more than an hour to recall these things, so I didn't classify the same phenomenon. I hope the landlord can be satisfied. I'm sure I can find more answers by rummaging through ancient poems.
4. Ancient poems, proverbs and sayings about physics 12: refraction and reflection of light in colorful clouds in Bai Di.
Jiangling, thousands of miles away, the relationship between distance and time.
Apes on both sides of the strait can't stop crying, and their voices are generated and spread.
The canoe has passed through Chung Shan Man, and the change of object position is called mechanical movement.
First, the energy knowledge in ancient poetry
1. Su Shi's poem "Bow like a full moon, look northwest, shoot Sirius". The energy conversion involved in poetry is the conversion from elastic potential energy to kinetic energy.
2. Li Bai's poem "Flying down three thousands of feet, it is suspected that the Milky Way has set for nine days". Waterfalls in poetry contain great mechanical energy.
Second, the reference knowledge in ancient poetry.
1, Mao Zedong's poem "Sit on the ground and walk 80,000 miles a day, overlook the sky and see John Wan" means that "sit on the ground" is static relative to the ground, and "walk on the sky" is moving relative to the sun.
2. Li Bai wrote in the poem "Looking at Tianmen Mountain" that "the green hills on both sides of the strait look at each other and sail alone." "Castle Peak Opposite" is set in a boat, and "Lonely Sail from the Sun" is set in a river bank.
3. In the lyrics of "Sparkling Red Star", "The small bamboo raft is in the middle reaches of the river and walks on both sides of the towering green hills". The Middle Reach of the Bamboo Raft River takes the earth as the reference, and A Cross-strait Journey on the Green Mountain takes the ship as the reference.
4. "A strong wind blew the well outside the fence last night." The well was blown away and the fence was used as a reference.
Third, the theoretical knowledge of heat and molecular dynamics in ancient poetry
1. In Lu You's Village Living in Mountain Happiness, "the flowers smell like sudden warmth, and the sound of magpies passing through the trees is like a new sunny day". The "fragrance of flowers" in poetry is the result of irregular movement of aromatic oil molecules secreted by flowers, and temperature affects the intensity of molecular movement.
2. In Zhang Xu's Stay in the Mountain, "even if there is no rain, the clothes are stuck in the depths of the areola". -Dew formation (liquefaction).
3. Bai Juyi's "Mu Jiang Yin" "Poor September is late at night, dew is like a pearl and the moon is like a bow"-the formation of dew (liquefaction).
5. Idioms about physical optics (15) are also acceptable. What is the phenomenon? China's ancient poems, idioms and proverbs contain rich physical knowledge. Here we * * * know the optical knowledge in ancient poems, idioms and proverbs, and deepen our understanding of light phenomena.
1. Light travels in a straight line 1. Watching the sky from a well: the frog at the bottom of the well sees a small sky, which is caused by the straight-line propagation of light. 2. Immediate analysis: When the bamboo pole stands in the sun, you can see the shadow immediately. It is precisely because the light travels in a straight line that the bamboo pole blocks the light and forms a shadow.
3. One leaf blocks the eyes, but Mount Tai is not seen. Analysis: A leaf blocks your eyes, and you can't even see the tall Mount Tai in front of you.
Use the knowledge that light travels in a straight line. 4. The trees grow dark in summer, and the balcony reflects the pond.
Analysis: the formation of "shadow" in the poem shows the straight-line propagation of light; "Balcony reflection" is a virtual image formed by light reflection. 5. What a coincidence of peaks, Jiang Yuan wants to fly.
(From Su Shi's "A Visit to the Jiangshan" in the Song Dynasty) Analysis: "How clever the peak is to block the sun" Why the sunlight is blocked by the peak and the light travels in a straight line. 6. The number of clouds reaches its peak, and it is half of Ming Jiang during the day.
(From Jaco Town by Yang Wanli in Song Dynasty) Analysis: The main idea of the poem is, why do you have to push away the clouds on the mountainside to see the summit, and the sun can only shine into the river through the cracks in the clouds. All light travels in a straight line.
Second, the reflection of light 1. Analysis of the Water Moon in the Mirror: The objects in Water Mirror are all virtual images, so it is said that the moon can't be caught in the water and flowers can't be picked in the mirror. 2. Pig and Bajie look in the mirror, but they are not human inside and outside.
Analysis: According to the imaging law of plane mirror, the image formed by plane mirror is equal to the size of the object, and the image of the object is symmetrical. Therefore, Pig Bajie saw the same image as himself, or the image of a pig. Nature is not a person inside and outside. 3. Analysis of a piece of jade before grinding: Before grinding, the surface of the jade is uneven and the light is diffused; After polishing, the jade surface is smooth and the light is reflected by mirror.
4. Until, holding up my cup, I asked the bright moon to bring me my shadow and let the three of us. (From Li Bai's "Drinking the Bright Moon Alone" in the Tang Dynasty: "Until, Raise a Glass, Ask the Bright Moon" shows that the moon forms a virtual image in the wine glass, which involves plane mirror imaging.
5. Baochai shines brightly and can be distinguished in the mirror. (From Qin Jia's "Giving a Woman" in the Han Dynasty) Analysis: "Baochai's head is bright", indicating that the light reflected by jewelry enters people's eyes, which is particularly dazzling; "Mirrors can recognize shapes" uses the knowledge of plane mirror imaging.
6. Hold the moon in your hand and let the fragrance of flowers permeate your clothes. (From jathyapple in Spring Mountain) Analysis: Why is there a moon in the water when the moon is in hand? The physical knowledge involved is plane mirror imaging.
7. The bright moon is thousands of miles away, and it is fleeting and still (from Fan Zhongyan's Yueyang Tower in Song Dynasty). Analysis: "bright moon" is because it reflects sunlight, and the moon itself does not shine; "Floating gold" means that the sunlight is reflected by the water surface, and it seems that the lake is golden; "Still shadows sink to the wall" is a virtual image formed by reflection. 8. How vast the world is, how close the trees are to heaven and how close the moon is to the water! .
Analysis (quoted from Meng Haoran's Sleeping in Jiande in the Tang Dynasty: "The water is clear and the moon is near!" It means that the moon forms a virtual image in the water, and the author feels very close to the virtual image of the moon. In fact, it is not scientific, because the imaging characteristic of flat mirror is that the distance from the object image to the mirror surface is equal, so it is not "close to the people"
Third, the refraction of light 1. Phantom analysis: light refracts through air with uneven density and sees a virtual image. A drop of water can see the sun, but a thing can see the spirit.
Analysis: A drop of water is equivalent to a convex lens. According to the imaging law of convex lens, the real image of the sun can be seen through a drop of water. The desert is lonely and straight, and the long river sets the yen.
Analysis: The "sunset" seen by the author is not the actual sun, but a virtual image formed by the refraction of light when it passes through the uneven atmosphere. The actual position of the sun is below the horizon. 4. The pool is shallow, and the lotus knows the fish.
(From Chu Guangxi's Fishing Bay in the Tang Dynasty) Analysis: "The water in the pool is shallow" means that the water in the pool is crystal clear, which makes people suspect that it is shallow, because the light refracts when it enters the air from the water, and what we see is the virtual image of the bottom of the pool. Fourth, the dispersion of light is 1. Sunset returns to Taohuawu, Liuhong.
Analysis: Catkin was originally white, but the poem said it was "patches of red". The reason is that sunlight consists of seven colors: red, orange, yellow, green, blue, indigo and purple. Red peach blossoms reflect red light and absorb other colors. When the catkins pass through a red peach blossom forest, only the red light is reflected, and the reflected red light shines on the white catkins, and the catkins naturally show a faint red color.
On this day last year, in this door, peach blossoms set each other off. Analysis: We see that the color of an object is determined by the color of its reflected light.
Red peach blossoms only reflect red light. Red light is reflected on people's faces, and people's faces look red.