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haiyennguyen030901
2 năm trước
Trong thí nghiệm Y-âng về giao thoa ánh sáng, khoảng cách giữa hai khe bằng 1mm và khoảng cách từ hai khe đến màn bằng 2m. Chiếu sáng hai khe bằng ánh sáng đơn sắc có bước sóng , người ta đo được khoảng cách từ vân sáng trung tâm đến vân sáng bậc bốn là 4,5mm. Bước sóng của ánh sáng đơn sắc đó là A. 0,76 m. B. 0,6 m. C. 0,5625 m. D. 0,4 m.
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GIUP MIK VS, MIK SE CAM ON VA VOTE DAY DU NHA, THANKS MN I. Rewrite the following sentences so that their meaning stays the same, using the words There was a loud noise next to my door last night, so I couldn’t sleep. → Because ………………………………………………………………… 2. Tornadoes can move objects as big as a car. → Objects………………………………………………………………….. 3. Your parents are happy because you behave yourself well. → If ……………………………………………………………………….. 4. They provided food then cleared up the debris. → After ……………………………………………………………………. 5. I don’t have free time , so I can’t go some where. → If I ………………………………………………………………………... 6. I don’t know the answer, so I can’t tell you. → If …………………………………………….………………………….. 7. They will do the test well. They will review them all hard. → If………………………………………………………………………… 8. The rescue workers evacuated the villagers in the raged flood to the safe place last night. → The villagers in the raged flood…………………………………………. 9. The students will provide aids for the homeless people tomorrow. → Aids……………………………………………………………………… The people will protect the environment now. The environment will be nicer. → If ………………………………………………………………………… 11. They don’t have a map, so they got lost → If…………………………………………………………………………. 12. The storm destroyed many houses in this village last week. → Many houses……………………………………………………………..................................... 13. Someone has stolen by bicycle. → My bicycle ……………………………………………………………………………………….. 14. If he doesn’t work hard, he will not pass his exam. → Unless ……………………………………………………………………. II. REWRITE THE FOLLOWING SENTENCES, USING THE WORDS IN BRACKETS. 1. The noise from the music club is loud, so the residents of the street cannot sleep. (because of ) → .................................................................................................................................................... 2. Vy had a stomachache because she ate a big dinner. (since) → .................................................................................................................................................... 3. Because it rained heavily, the road in front of my house was flooded. (due to) → ...................................................................................................................................................... 4. His room is untidy, so his mother is unhappy. (because) → ....................................................................................................................................................... 5. Global warming happens when there is too much carbon dioxide (CO2) in the atmosphere. (causes) → ....................................................................................................................................................... III. COMBINE THE FOLLOWING SENTENCES USING THE WORDS IN BRACKETS. 1. Noise pollution happens. There is a change in animals’ living pattern. (causes) → ..................................................................................................................................................... 2. Radioactive pollution is very dangerous. It can cause abnormal growth. (since) → .................................................................................................................................................... 3. The area is uninhabitable. The Chernobyl nuclear accident happened. (made) → ...................................................................................................................................................... 4. Fossil fuels such as coal or oil are burned. Acid gases are produced. (so) → ....................................................................................................................................................... 5. Acid rain is dangerous. Trees’ leaves are damaged. (because of) → ....................................................................................................................................................... 6. Leaves are damaged. The tree cannot get enough food energy to stay healthy. (because) → ......................................................................................................................................................... IV. Find the words that need correcting. 1. Hundreds of houses destroyed after a tornado hit the small town of Texas. A B C D 2. The earthquake occurred at midday when many people had had lunch. A B C D 3. Water pollute in the lake has made the fish die. A B C D. 4. Factorieswon’t dump waste into rivers if the government will fine them heavily. A B C D

II. Combine each pairs of these sentences, using ENOUGH 11. I didn’t have time. I couldn’t eat breakfast this morning. …………………………………………………………………………………………………… 12. The room is not wide. We can’t hold a party in this room. …………………………………………………………………………………………………… 13. That chair is not strong. We can’t stand so long on that chair. …………………………………………………………………………………………………… 14. It was very hot. You can fry an egg on the pavement. …………………………………………………………………………………………………… 15. You are quite thin. You can slip between the two bars. …………………………………………………………………………………………………… 16. All my guests will need chairs. But I haven’t got any. …………………………………………………………………………………………………… 17. Mary doesn’t have money. She can’t buy that Martin bicycle.

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