b1: dùng tia sáng truyền từ thủy tinh và khúc xạ ra không khí. Tia khúc xạ và tia phản xạ ở mặt thủy tinh tạo với nhau 1 góc 90độ , chiết suất của thủy tinh là 3/2. hãy tính tròn số giá trị của góc tới
b2: chiếu một tia sáng từ không khí vào thủy tinh có chết suất 1,5. hãy xác định góc tới sao cho: góc khúc xạ bằng nửa góc tới
mk cần tóm tắt nữa ạ
Cho 2 điểm AB cùng nằm trên 1 đường sức điện trường do 1 điện tích điểm Q>0 gây ra. Biết độ lớn cường độ điện trường tại A là 36V/m tại B là 9V/m
a) Xác định cường độ điện trường tại trung điểm M của AB
b) Nếu đặt tại M 1 điện tích điểm Qo= -10^-2 C thì độ lớn của lực điện tác dụng lên Qo là bao nhiêu? Xác định phương và chiều của lực
Dựa vào độ âm điện , hãy loại liên kết giữa hai nguyên tử trong phân tử các chất sau: O2;CaO; MgO ; CH4 ; AlN ; N2 ; NaCl ; HCl ; AlCl3 . phân tử chất nò có chứa liên kết on? liên kết cộng hóa trị không cực, có cực ? viết CT e, CTCT của các hợp chất cộng hóa trị.
NHỜ MỌI NGƯỜI NHÉ
II. Sentence transformation
10. “Don’t throw things away” Miss Linda said to the students.
Miss Linda ……………………………………………………………
11. Do you mind opening the windows
Would you…………………………………………………………….
12. "Is the Great Wall in China" She asked me.
She asked…………………………………………………………..
13. All of you must do this test carefully.
This test………………………………………………………………
14. She asked him if he would stay with his friends the next day.
She asked him "…………………………………………………….."
15. The Chinese invented paper in the century A.D.
Paper ____________________________________________
16. This factory produces 10,000 cars each year.
10,000 cars________________________________________
17. "My sister likes cooking.", said Nam.
Nam said that…………………………………………………………………
18. " Is Ha Long Bay in the Northern Viet Nam, Phuong " asked Mary.
Mary asked Phuong…………………………………………………………
19. The question is very difficult. I can't understand it.
The question is too...........................................................................................
20. Using a computer is very simple.
It is ……………………………………………………………………….
21. "Send me a postcard when you arrive in Paris!"
I told Lan …………………………………………………………………..
22. He did his homework
His homework………………………………………………………….
23. I would like you to help me to put the chairs away.
Do you mind…………………………………………………………………
24. I get to work in half an hour.
It takes me…………………………………………………………………..
25. “Is Ha Noi the capital of Viet Nam?”
Peter asked Mary……………………………………………………………
26. My grandfather bought this clock 30 years ago.
This clock......................................................................................................
27. He said to us, “You are my best friends.”
He said that……………………………………………………………………
28. Clement Clarke Moore wrote the poem in 1823.
The poem ...................................................................................... ……………..
29. Christmas cards should be sent a week before Christmas Day.
You ............................................................................................... ……………..
30. she said to me, “Turn off all the lights when you go out.”
She asked me…………………………………………………………………
31. The last time I played tennis was in 1990.
I haven’t ...................................................................................... ……………..
32. Roses can’t possibly grow in such poor ground.
It is impossible .......................................................................... ……………..
33. She asked the tourists, “Do you know the way to the station?”
She asked the tourists if……………………………………………………..
34. Shall I sit here ?
Do you mind if ………………………………………………………….
III.Rewrite the sentences:
1.Sydney Opera House /completed/1973/was.
Ø………………………………………………………………………………………..
2.a machine/is/ this/ used to/ wash/ clothes/which/is.
Ø………………………………………………………………………………………
3.the/ held/ festival/was/where?
Ø………………………………………………………………………………………
4.an important/ Christmas/festival/ in many countries/is.
Ø………………………………………………………………………………………
5.people/took/ part/ how/ in/each/ activity/ many ?
Ø………………………………………………………………………………………..
6. Hue / Mr Nam / tonight / arriving / in / is. .........................................................................................................................................
7. live / in / months / going / England / they / two / are / to.
...........................................................................................................................................
8. It / not / difficult / is / this sentence / to / translate / into / English.
.......................................................................................................................................
9. Last week / she / buy English - Vietnamese dictionary
........................................................................................................................................
10/ Do/ mind/ if/ you/ close/ I/ the/ window? (sắpxếp)
à.......................................................................................................................................
11. delighted/ passed / I / that / you / English / am/ exams / your / have. (sắpxếp)
…………………………………………………………………………. …………..
12. storm / destroyed / the / are / houses/ now/ the / by / rebuilt/ being. (sắpxếp)
…………………………………………………………………………………………
13.He/ his/ him/ birthday/ happy/ is/ parents/ give/ a/ that/ will/ present/ very. (sắpxếp)
……………………………………………………………………………………………
14. I / live / far / city / so / life / quite / peaceful
…………………………………………………………………………………\
15. Everyday / get / early / 4.30
……………………………………………………………………………….
16. I / clean / teeth / wash / face / have quick breakfast / walk / school
…………………………………………………………………………….
17. It / take / 2 hours / get there
……………………………………………………………………………….
18. I / usually / have / lessons / morning / so / often / home late / 11.20
…………………………………………………………………………….
19. I / study hard / school / because / not / have time / study / home
……………………………………………………………………………
20. I / help / parents / work / farm / afternoon
………………………………………………………………………….
21. Summer/ parents / often / take me / Vung Tau
…………………………………………………………………………..
22. It / be / great time / because / I / spend / all time/ there / go / swim
………………………………………………………………………..
23. Although / life / country / still hard / I / love / very much
…………………………………………………………………
I. Fill in each blank with a suitable preposition:
1. English people are fond _______ football.
2. Are you interested _______ picture- books ?
3. She often stays ______ home ______ Sundays.
4. Don’t tell your sister _________ that news.
5. The pupils often go _____ school _____ bicycles.
6. The first May Day meeting was held _______ 1890.
7. Are you afraid _______ swimming in the sea ?
8. My brother is good ______ English.
9. My uncle lives _______ Ho chi minh city.
10.The boy was born ________ a very rich family
11. Instead ………………... going to the theater, we’ll go to the concert.
12. There is nothing to prevent the children………..……..playing there.
13. They will be here……………..…..a few minutes.
14. Most children often participate……….….outdoor activities in their free time.
15. You are very different…………….…. your brother.
16. Hoa is good …………….……. learning English.
17. It’s very kind …………….…. you to help me with the housework.
18. Da Lat is famous………………. many kinds of flowers.
19. Could I help you ................................. your bag?
20. Na got up late this morning because her alarm clock didn’t go..................................
II. Sentence transformation:
1. Mai went to bed early because she didn’t want to be late for the test the next morning.
Mai went to bed early so ..................................................................................
2. Nam has just finished his homework.
His homework ………………………………………………………………
3. The man is my English teacher . He is talking to the headmaster.
The man …………………………………………………
4. That was the old house . It was built by my father.
That was ………………………………………………………..
5. Where is the nearest post office?
Could you ………………………………………………………….?
6.Hanh is studying very hard because she doesn’t want to fail in the exam.
Hanh is studying very hard in order ……………………………………
7.Many people speak English in the world.
English…………………………………………………………………..
8.We find it difficult to understand this question.
This question ……………………………………………………………
9. Working in those conditions is impossible.
It’s ……………………………………………………………
