Sound is produced by the vibration of the sound source (bell strikes to produce bell), and sound can spread in the air (for passenger ships)
2. "Go back to Jiangling thousands of miles a day. The apes on both sides of the strait can't stop crying, and the canoe has passed Chung Shan Man. " (Tang dynasty? Li Bai? "Early Baidu City")
Analysis: The first two poems literally mean that the poet has to go back and forth to Jiangling in "one day", that is, the journey takes 12 hours (1000 km = 1000 km). On this basis, roughly calculate the ship speed: v = s/t = 654300 km. The speed of the ship is only 10 ~ 2 1.6km/h, so Li Bai's boat is too fast. In fact, it just expresses the mood of the poet anxious to return.
3. When my boat is sailing in the fog, the day is getting dark, and ancient memories begin to emerge. How vast the world is, how close the trees are to heaven, and how clear the moon in the water is! (Tang dynasty? Meng Haoran? Night parking on Jiande River)
Analysis: When the poet arrived at the inn at dusk, he was still enjoying the night scene with great interest. The water in Jiande River is so clear and calm. The poet takes water as a mirror, and the bright moon seems close at hand, so he can sit back and relax tonight. Obviously, it is the "flat mirror" that makes the bright moon in the sky "image" in the water.
4. Wen Tianxiang, a national hero of the Southern Song Dynasty, once vowed by the Yangtze River that "my heart is a magnet, which does not mean that the South will never stop swearing". Here, the author uses a magnet to compare his determination to resist gold.
Analysis: One of the properties of magnets refers to the north and south, so Wen Tianxiang used the property of "magnetic needle stone refers to the north and south" to compare his determination to resist gold. This makes people involuntarily think of Wen Tianxiang's famous sentence "Since ancient times, whose life has not died?" .
The fragrance of flowers suddenly warms people's hearts, and the sound of magpies makes them shine through the trees. "These are two poems by Lu You, a poet in the Southern Song Dynasty. From a physical point of view, it can be understood that the aromatic oil molecules secreted by flowers accelerated, indicating that the surrounding temperature suddenly changed at that time.
Analysis: The poet expressed his admiration for the beautiful nature with a beautiful style and accurately described the details in the process of seasonal alternation. "Flower breath attacks people" shows that the poet has already felt the fragrance of flowers without touching them, which is caused by the irregular movement (diffusion) of aromatic oil molecules secreted by flowers; When the temperature around you suddenly rises, you will feel "sudden warmth".
6. Small bamboo rafts are in the middle reaches of the river and walk on both sides of the towering green hills. These two lyrics have been deeply rooted in the hearts of the people with the famous movie "Sparkling Red Star". Please use physical knowledge to analyze the phenomenon.
Analysis: "Walking" and "swimming" represent two different movements, which are called mechanical movements in physics. "Walking" on both sides of "Castle Peak" is actually an anthropomorphic statement. People are standing on the "bamboo raft". If the bamboo raft is used as a reference, then the green hills are moving!
7. Holding the hidden moon makes the flowers smell all over the clothes. Physical knowledge:
"Holding the moon in the hand" is a mirror reflection phenomenon.
"Clothes are full of flowers" is a phenomenon of molecular diffusion.
8. Rizhao incense burner produces purple smoke. Looking at the waterfall hanging in Qianchuan from a distance, I went straight down to thousands of feet. Suspected that the Milky Way had fallen for nine days.
Physical knowledge: the kinetic energy of "flying water" is increasing, while the gravitational potential energy of water is decreasing.
9, the peaks reflect the mountains, no mountains, no water, no ecstasy.
Physical knowledge: reflection and refraction of light
10, peach blossoms set each other off in red
Physical knowledge: The red light reflected by peach blossoms is the decisive factor for the color of objects.
1 1, you can tell a person by his voice.
Physical knowledge: timbre, one of the three characteristics of music.
12, a poem by Li Yi, a poet in the Tang Dynasty, is called "Happy to see my brother goodbye", which describes: "After these ten years of boredom, we meet again. We have all changed a lot. The first time I heard your last name, I thought you were a stranger. Then I heard your name, and I remembered your young face.
As can be seen from "Ask the surname", there is a feature in the voice that reminds the poet of his memory ten years ago. This feature is one of the three major features of music.
13 Yu Qian's lime song
Thousands of mountains are tempered,
If the fire burns accidentally.
I'm not afraid of fractures,
Leave white and green on the earth.
The first sentence is that physical changes are followed by chemical changes.