какие частицы являются свободными носителями электрических зарядов в полупроводниках ?

какие частицы являются свободными носителями электрических зарядов в полупроводниках ?
- Предмет:
  Физика
- Автор:
  briana
- 5 лет назад

Ответы 1

Полупроводник занимает промежуточное место между проводниками и диэлектриками. В полупроводнике носителями заряда могут являтся- отрицательно заряженные свободные электроны (n-проводимось);- положительно заряженные "дырки", т.е. свободные места на орбитах атомов (p-проводимость).
- Автор:
  tategallagher
- 5 лет назад
- 0
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Помогите срочно !!!!
Part I The Past Simple Tense
№1 Переведите на английский язык, употребляя глагол to be в Past Simple
1. Она была больна вчера 2. Они были в кино 3. Погода была ужасная

№2 Вставьте глагол to be в Past Simple
The house … not clean. The sink … broken. There … dirty dishes on the kitchen table and in the sink. There … nothing in the fridge. There … no vegetables for dinner, there … no juice for her children. There … not even bread in the house! She … tired and hungry. She … just exhausted. She … ready to sleep as long as she can.

№3 Раскройте скобки, употребляя глаголы в Past Simple
1. Their little girl (to cry) a little and then (to smile). 2. Her brothers (to shout) at her. 3. Mrs Smith (to work) in the kitchen.
4. She (to bake) a delicious apple pie. 5. She (to cook) a nice dinner.

№4 Перепишите следующий текст в прошедшем времени
On Monday we have five lessons. The first lesson is English. At this lesson we write a dictation and do some exercises. Nick goes to the blackboard. He answers well and gets a “five”. Pete doesn’t get a “five” because he doesn’t know his lesson. After the second lesson I go to the canteen. I eat a sandwich and drink a cup of tea. I do not drink milk. After school I don’t go at home at once. I go to the library and take a book. Then I go home.

Part II The Past Continuous Tense

№1 Раскройте скобки, употребляя глаголы в Past Continuous
1. My sister is fond of reading. She (to read) the whole evening yesterday. 2. When I went out into the garden, the sun (to shine) and birds (to sing) in the trees. 3. You (to eat) ice-cream when I rang you up yesterday? 4. What your father (to do) from eight till nine yesterday? 5. Why she (to cry) when I saw her yesterday?

№2 Раскройте скобки, употребляя глаголы в Past Continuous
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№3 Прочитайте текст, переведите. Выпишите глаголы в форме Past Continuous. Ответьте на вопрос: WHO BROKE THE WINDOW?
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№1 В следующих предложениях измените время глагола на Present Perfect. Переведите предложения на русский язык
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какие частицы являются свободными носителями электрических зарядов в полупроводниках ?

Ответы 1

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