192 1 year, the blue waters of the Mediterranean Sea.
Indian scientist Raman (m? N) After making a research report on acoustics and optics in the Royal Society, I returned home by boat via the Mediterranean Sea. The sun is warm, the warm wind is slow, and the fish scales are shining on the deep blue sea. Among the people walking on the deck, a conversation between an Indian mother and son caught Raman's attention.
? Mom, what's the name of this sea?
? Teaching underground! ?
? Why the Mediterranean?
? Because it is sandwiched between the European continent and the African continent. ?
? Then why is it blue?
The young mother was speechless? ], the eyes for help just met Raman who was listening to their conversation with great interest. Raman told the boy: The sea is blue because it reflects the color of the sky. ?
Before that, almost everyone agreed with this explanation. It comes from the British physicist Rayleigh. This is lazy (du? A great scientist, who is famous for gas, once explained the color of the sky with the theory that sunlight is scattered by atmospheric molecules, and concluded that the blue color of seawater is caused by reflecting the color of the sky.
But somehow, after bidding farewell to the mother and son, Raman suddenly had doubts about his explanation. That curious child, those big eyes for knowledge, those constantly emerging? Why? , make Raman feel guilty. As a scientist, he found himself unconsciously losing the existence of the boy? Known? Pursuit? Unknown? Curious, his heart can't help a shock.
Losing curiosity is the biggest taboo of scientific discovery and invention (J? Hu? ), even successful scientists will turn a blind eye and stop.
After Raman returned to India, he immediately set out to study why the sea water is blue. First of all, he found that the experimental evidence explained by Rayleigh was insufficient and unconvincing; Then, starting with the interaction between light scattering and water molecules, he conducted in-depth research. Finally, he used the fluctuation theory of Einstein and others to obtain sufficient data of light scattering when passing through clear water, ice cubes and other substances, and proved that the principle that water molecules scatter light to make seawater appear blue is exactly the same as that that that atmospheric molecules scatter sunlight to make the sky appear blue. That is to say, the sea looks blue, not because it reflects the blue of the sky, but because it scatters sunlight. Later, Raman in solid, liquid (y? ) and gas, the ubiquitous light scattering effect is found. The light scattering effect he discovered is called. Raman effect? It provided strong evidence for the scientific community to finally accept the particle theory of light at the beginning of the 20th century.
1930, the question mark of the boy on the Mediterranean ship led Raman to the podium of the Nobel Prize in Physics, making him the first scientist to win this honor in the history of India and Asia.
The story of the boy with endless problems constantly reminds people: never give up on you, right? Known? Curious, maybe the new discovery is on you? Known? what's up Unknown? In the middle.
The teaching plan of why the sea is blue in the second volume of the sixth grade
First, the teaching objectives:
1. Read the text for the first time and master the main contents of the text;
2. Learn the new words and phrases in this lesson
3. Find and read sentences that are deeply touched or inspired and benefit a lot.
Second, the teaching focus:
Master the main content of the text and understand how Raman discovered the light scattering effect.
Third, the teaching difficulties:
Understand the reason why the sea water is blue and feel the important role of curiosity in scientific research.
Fourth, the preparation of teaching AIDS:
Raman materials and multimedia teaching
Verb (abbreviation of verb) teaching process;
(1) Introduction: Hello, classmates! Maybe we will be curious about natural phenomena: why does the sun always rise and set in the west? Why does the moon always have sunny days and full moons? Why does the sky sometimes rain and sometimes clear? The question mark takes us into the unknown world. It is precisely because of the unknown and curiosity that we have made new discoveries and inventions in human science and made scientific and technological progress. Why is the sea blue? Today we are going to learn the story of Raman, a famous Indian physicist.
(B) the preliminary reading of the text, the overall perception
1. Read the text together and feel the text: accurate and neat pronunciation is required.
2. Self-study: (1) Read the text silently, mark the order, and outline the new words and sentences you don't understand.
(2) Thinking: 1) What is the main content of the text? Did you find the story? Six elements? : time, place and person? The cause, process and result of the event
2) Why is the sea blue?
This part can be discussed with your deskmate.
(3) Communication between teachers and students
1. Six elements of the story (main points): (1) Time: 192 1 year; (2) Location: On a ship in the Mediterranean; (3) People: Indian scientist Raman, a pair of Indian mother and son.
Introduction to Raman: (1888 1970) is a famous scientist in India in the 20th century, 1930, and won the Nobel Prize in physics for his research work on light scattering and the discovery of Raman effect. Raman is the first scientist and educator in Asia who won the Nobel Prize in Physics, and has trained many outstanding graduate students for India.
(4) Cause: put forward by an Indian boy? Why is the sea blue? This question made Raman doubt the explanation of the British physicist Rayleigh that the sea water was blue, and the boy's curiosity inspired and alerted him. (5) After Raman returned to China, he made an in-depth study of the questions raised by the boy, found out the reason why the seawater is blue due to sunlight scattering, and found the light scattering phenomenon (Raman effect) that is common in solids, liquids and gases, and became the first scientist in Asia to win the Nobel Prize in physics. (6). Known? Curious and good at following? Known? what's up Unknown? Make new discoveries.
Transition: Now that we know the six elements of Raman story, please follow them. Six elements? Summarize the main content of the article: teacher guidance.
2. The main content of the article (key point): It tells that Indian scientist Raman got inspiration from the curiosity of a little boy on a Mediterranean ship, thus he studied the reason why the sea water is blue, and found an ubiquitous light scattering effect from solid, gas and liquid respectively, and finally won the Nobel Prize in physics, which shows Raman's spirit of continuous exploration and commitment to scientific research.
Transition: We have a preliminary understanding of Raman's story. The title of the article is "Why is the sea blue?" Please find out why the sea is blue: Rayleigh: The sea reflects the color of the sky.
Raman: seawater reflects sunlight (real reason)
Summary inspiration: story inspiration (difficulty): doubt, curiosity, exploration, research, etc.
3. Learn new words and explain words (basic):
New words: four abilities to read: lazy, taboo, taboo (pay attention to pronunciation), liquid; Four will write: lazy (pay attention to writing), naive, guilty (pay attention to pronunciation), liquid.
Explanation:
(1) Stunned: Unable to speak for a while due to excitement, anger or inexplicable reasons.
(2) Interesting: very lively
(3) Guilt: I feel ashamed and uneasy because of my mistakes.
(4) Quite successful: quite, very; Achievement means many achievements.
(5) Close your eyes: close your eyes, block your ears, and don't listen to exaggerated descriptions that are indifferent to external things and divorced from reality.
(6) Scattering: When light passes through dusty air and other media, some light changes direction in many ways.
(4) Read the text silently and find out the sentences that you like or give people inspiration and benefit (read and find).
Example:? Losing curiosity is the biggest taboo of scientific discovery and invention? etc
(5) expansion:
Transition: Summing up inspiration: Raman got inspiration from the little boy's curiosity and studied it deeply, and found the real reason for the blue water, found it? Raman effect? , made great contributions to science, won the grand prize, and what played a big role? (Curious) So who are the scientists in history because? Curiosity? And there are new discoveries, inventions or outstanding achievements? Teachers give one or two examples, so that students can think in class or look up information after class to find one or two examples, which can also remind students of their childhood curiosity (flexible play)
1. Newton: When I was a child, I was curious to see the apple fall to the ground: Why did the apple fall instead of falling? Grow up and learn: discover the law of gravity and become a famous British physicist.
2. Watt: Seeing the water in the kettle boiling, I asked why the lid kept jumping up and thinking. Later, when I grew up, I invented the steam engine, laying the foundation for the first industrial revolution.
3. Copernicus: When I was a child, I was curious about the world: Why does the sun always rise and set in the west? There are so many stars in the clear night sky, but why are there no traces during the day? Why do chickens come out of eggs instead of hens? He pursued science persistently and later became a famous astronomer.
4. Shen Kuo, a great scientist in the Northern Song Dynasty: Reading Bai Juyi's poem Peach Blossom in Dalin Temple? In April, the beauty of the world is exhausted, and the peach blossoms in the mountain temple are blooming? Time to think: Why are they all peach blossoms, and the flowering time is so far apart? When he visited the temple in the deep mountain, he found that the temperature there was much lower than that at the foot of the mountain, and he understood the truth. Note: Peach blossoms usually bloom in March.
5. Negative examples:
Justus von Liebig: chemical elements were found in Indra, a chemist? Bromine? Four years ago, due to the lack of strict scientific attitude, Justus von Liebig did not seriously analyze the elements of the brown bottle sent by German businessmen, but it was related to chemical elements? Bromine? You know, this brown bottle contains something that was unknown at that time? Bromine? , with the conditions at that time and his research is fully capable of finding? Bromine? basic
Summary: The world is changing with each passing day. We find that great scientists who have made outstanding achievements have a curiosity when they are young and at work. What should we do if we are diligent, curious and careful? To find problems from ordinary things, from? Known? Exploring? Unknown?
Six, homework:
1, continue to preview the text
Write familiar words and extract sentences that inspire you.
Seven, with the blackboard:
Boy's curiosity? Enlighten, be alert and study deeply.
?
The real reason for the blue water.
? (Scattering of light by seawater)
Solid, gas, liquid, etc. )
Raman effect. Compare RAYLEIGH SCATTERING
?
Won the nobel prize in physics.
Revelation: In? Known? Pursuit? Unknown?