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
1. When I (to go) to school the day before yesterday, I met Mike and Pete. 2. I (to play) computer games at five o’clock yesterday. 3. She (to cook) the whole day yesterday. 4. We (to wash) the floor in our flat from three till four yesterday. 5. He (to wash) house the whole day yesterday. 6. My sister (not to play) the piano at four o’clock yesterday.

№3 Прочитайте текст, переведите. Выпишите глаголы в форме Past Continuous. Ответьте на вопрос: WHO BROKE THE WINDOW?
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Part III The Present Perfect Tense

№1 В следующих предложениях измените время глагола на Present Perfect. Переведите предложения на русский язык
1. The waiter is putting a bottle of lemonade in front of him. 2. I am eating my breakfast. 3. We are drinking water. 4. He is bringing them some meat and vegetables. 5. You are putting the dishes on the table.

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№3 Раскройте скобки, употребляя глаголы в Present Perfect
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№4 Напишите III форму глаголов: 1. do 2. find 3. finish 4. burn 5. ride

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какие частицы являются свободными носителями электрических зарядов в полупроводниках ?

Ответы 1

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