Предмет: Физика, автор: Dasha11100

Что характерно для КРИСТАЛЛИЧЕСКИХ тел?
а) обладают анизотропией
б)сохраняют форму
в) сохраняют объём
г) переходят в жидкое состояние только при определённой температуре-температуре плавления.
Помогите, пожалуйста) очень прошу, мб несколько вариантов ответа

Ответы

Автор ответа: fatt52

Все перечисленные характерны для кристаллических тел. Здесь отдельно стоит вопрос с анизотропией. Все кристаллы ей обладают. Но когда размер кристалла очень мал, это свойство иногда не считают (например у металлов).

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Автор ответа: UmbertoVargas

анизотропией обладают жидкие кристаллы и монокристаллы, но не поликристаллы - они изотропны

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Summative assessment for the unit «The Natural World»
Task 1 Reading
I variant
Sacred pythons
One day a very long time ago, some of Naayire people went hunting. They walked
and walked in the bush but found nothing, They were very far from home. "We must sleep in the bush, " the chief said, - "We must find a good place to sleep".
The hunters were not afraid to sleep in the bush but they knew: animals
sometimes killed 1 And there were some bad people too, in the bush. The hunters came to a place with big trees round it. They decided to rest and sleep on the grass. They didn't make a fire and ate only some nuts which 2 Then they went to sleep. All of them were tired. They slept soundly. They didn't hear that their enemies were coming nearer and nearer to them.
But in one of the trees above the sleeping men something moved and fell down on
the head of a young hunter. He jumped up and cried: a big python was on his head! The Naayire people 3 and saw the enemies round them. A fight began. Soon the enemies ran away and that was the end of 4 The Naayire hunters came up to their chief to talk about the fight. "What made you jump up?"- the chief asked. "It was a python, " - he said, - "It fell on my head but it did not kill mel" Then the chief said: "That python saved our lives. Pythons will be sacred animals in our country". Even today the Naayire people love pythons, If you go into their houses in the rainy season, you will find a python there. The pythons5 anyone; they don't eat even the chickens!
Complete the gaps in the text with these words:
the fight, got up quickly, they carried in their bags, never harm, sleeping hunters
/5 points/
Task 2 Speaking
Answer these questions. Give detailed response; send it by a voice message
1. The Natural World" what does it mean to you?
2. How do you think the world will look in 50 years' time?
3. Why do animals become extinct?
4. Do you think we are doing enough to save endangered species? Give some
examples
5. What are your responsibilities in order to solve this problem?
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