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HN) Exercises (1)You take 200 milligrams of a headache medicine, and after 4 hours, 120 milligrams remain in your system. If the effects of the medicine wear off when less than 80 milligrams remain, when will you need to take a second dose, assuming the anmount of medicine in your system decays exponentially? 13 ส.ค. The half-life of Radium-226 is 1590 years. If a sample initially contains 200 mg. how many milligrams will remain after 1000 years? )The half-life of Fermium-253 is 3 days. If a sample initially contains 100 mg, how many milligrams will remain after 1 week? บ้อ The half-life of Erbium-165 is 10.4 hours. After 24 hours a sample still contains 2 mg. What was the initial mass of the sample, and how much will remain after another 3 days? The half-life of Nobelium-259 is 58 minutes. After 3 hours a sample still contains10 mg. What was the initial mass of the sample, and how much will remain after another 8 hours? (6) A scientist begins with 250 grams of a radioactive substance. After 225 minutes, the sample has decayed to 32 grams. Find the half-life of this substance. A wooden artifact from an archeological dig contains 60 percent of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years.)

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2 Match the beginnings to the endings of the sentences. 1 ปี A joumalist wants to 2 ]ี Ifyou need a lift from the station, a update your Social media profiles. b love reading comics. ( interview us about the crime. d give us a cal. e post that comment on my blog? 3 When did he It's important to 5 ]ี Some kids กับู Ad) ที่ใช้อธิบายคำคมใุนประโยค 3 Match the adjectives in the box to the underlined nouns, There is one extraadjective. 4 4 Complete the gaps using the adjectives in the box. There is one extra adjective. delighted disgusting disgraceful - extraordinary - superior terrified disgraceful horrifying magnificent " miraculous - superior terrified คาคุม 1 Tve never seen weather like this before. It's 25C and it's January! 1 A Were they very badly hurt in the car crash? B I'm afraid so. They suffered. injuries. 2 A I'mnot that impressed by the old Venetian palaces. B lcan't believe you think thatl They're. buildings! 2 Myra was inside the burning building and didn't know how to escape. 3 Ben was really pleased to pass the exam. 3 A Can you believe it? Arsenal won! They scored twice in the last minutel 4 The politician who took the money should be ashamed of his behaviour. B Tknow. It was a.. -recovery! 4 A Hosting the Olympic Games in London was a great idea, was't it? 5 This food is very oily and there's far too much salt - Tcan't eat it. B You're joking! It was a of money. waste 5 Choose the correct option. 1 Richer countries should do more to help reduce poverty in forming / growing / developing countries. 2 The minimum salory/ earning / wage rose last month by 2% to E7.20 per hour. 3 We offer excellent working conditions / requirements / rules for all of our employees. 4 Does the council empty the gloss / bottle / recycle banks every week? 5 Our Services for jบnk / rubbish / woste disposal include burning burying and recycling 6 Complete the sentences with one word from box A and one from box B. There are two extra words จับคู่คำผสม ในกล่อง + 9) - ใชใประโยดที่มีคmaนมายๆรงกัน (A)bottle developing greenhouse - landfill - locally = vegetable waste B)bank - conditions - countries disposal living produced site is where you can take glass objects for recycling food comes from farms that arent far away. 1 A 2 3 are places with little industrial and economic activity. rubbish goes into ahuge hole in the ground. is the way we get rid of everythingwe don't want to keep. 4 Ata 5

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Vocabulary ARCHERY My name is Mina, and "m a competi level for many years now, and Ive e - 1-01 1 Listen and number. Target archery is a very popular Spo almost call it a national pastime for might be why South Korea is know recent years. In fact, South Korean archery at the 2016 Rio OlympicGะ The rules of target archery are simp Ccompetitions take place at 18m. O, divided by ends which are counted at a target with ten rings drawn on add up their Scores and the archer outdoor pastime category recent GEOCACHING DONATION Hello, I'm Andrew and have been love exploration and adventure. Its, to search for hidden treasures calle BOX contribute cache exploration target require the participant to solve puz can Ccontain all sorts of different tre geocache is a logbook. The logbo0า cache and contributed to it. Match the words with the definitions. * a. an activity you enjoy doing in your free time * b. happening or beginning a short time ago 1. recent If you're inter yourself. Lo set off on ye time to join in seeing what 1 e for nearby ge. heocaching ad- 2. category 3. outdoor * C. to give something in order to provide or achieve something * d. happening in a place that is outside * e. to go around a place you've never been to before * f. a group of people or things that are similar 4. pastime 5. exploration : 6. target ompre, Lsion 7. contribute * g. a secret supply of something put in a container * h. an object that is shot at during shooting practice 6 Circle trg ปse. 8. cache

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ช่วยหน่อยค่าา แงๆ ข้อ1ใหญ่กับข้อ2ใหญ่นะคะ ขอบคุณล่วงหน้าค่าา🥺🙏🏻💖

Vocabulary ARCHERY My name is Mina, and "m a competi level for many years now, and Ive e - 1-01 1 Listen and number. Target archery is a very popular Spo almost call it a national pastime for might be why South Korea is know recent years. In fact, South Korean archery at the 2016 Rio OlympicGะ The rules of target archery are simp Ccompetitions take place at 18m. O, divided by ends which are counted at a target with ten rings drawn on add up their Scores and the archer outdoor pastime category recent GEOCACHING DONATION Hello, I'm Andrew and have been love exploration and adventure. Its, to search for hidden treasures calle BOX contribute cache exploration target require the participant to solve puz can Ccontain all sorts of different tre geocache is a logbook. The logbo0า cache and contributed to it. Match the words with the definitions. * a. an activity you enjoy doing in your free time * b. happening or beginning a short time ago 1. recent If you're inter yourself. Lo set off on ye time to join in seeing what 1 e for nearby ge. heocaching ad- 2. category 3. outdoor * C. to give something in order to provide or achieve something * d. happening in a place that is outside * e. to go around a place you've never been to before * f. a group of people or things that are similar 4. pastime 5. exploration : 6. target ompre, Lsion 7. contribute * g. a secret supply of something put in a container * h. an object that is shot at during shooting practice 6 Circle trg ปse. 8. cache

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ช่วยหน่อยค่าา แงๆ ข้อ1ใหญ่กับข้อ2ใหญ่นะคะ ขอบคุณล่วงหน้าค่าา🥺🙏🏻💖

Vocabulary ARCHERY My name is Mina, and "m a competi level for many years now, and Ive e - 1-01 1 Listen and number. Target archery is a very popular Spo almost call it a national pastime for might be why South Korea is know recent years. In fact, South Korean archery at the 2016 Rio OlympicGะ The rules of target archery are simp Ccompetitions take place at 18m. O, divided by ends which are counted at a target with ten rings drawn on add up their Scores and the archer outdoor pastime category recent GEOCACHING DONATION Hello, I'm Andrew and have been love exploration and adventure. Its, to search for hidden treasures calle BOX contribute cache exploration target require the participant to solve puz can Ccontain all sorts of different tre geocache is a logbook. The logbo0า cache and contributed to it. Match the words with the definitions. * a. an activity you enjoy doing in your free time * b. happening or beginning a short time ago 1. recent If you're inter yourself. Lo set off on ye time to join in seeing what 1 e for nearby ge. heocaching ad- 2. category 3. outdoor * C. to give something in order to provide or achieve something * d. happening in a place that is outside * e. to go around a place you've never been to before * f. a group of people or things that are similar 4. pastime 5. exploration : 6. target ompre, Lsion 7. contribute * g. a secret supply of something put in a container * h. an object that is shot at during shooting practice 6 Circle trg ปse. 8. cache

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ช่วยหน่อยค่าา แงๆ ข้อ1ใหญ่กับข้อ2ใหญ่นะคะ ขอบคุณล่วงหน้าค่าา🥺🙏🏻💖

Vocabulary ARCHERY My name is Mina, and "m a competi level for many years now, and Ive e - 1-01 1 Listen and number. Target archery is a very popular Spo almost call it a national pastime for might be why South Korea is know recent years. In fact, South Korean archery at the 2016 Rio OlympicGะ The rules of target archery are simp Ccompetitions take place at 18m. O, divided by ends which are counted at a target with ten rings drawn on add up their Scores and the archer outdoor pastime category recent GEOCACHING DONATION Hello, I'm Andrew and have been love exploration and adventure. Its, to search for hidden treasures calle BOX contribute cache exploration target require the participant to solve puz can Ccontain all sorts of different tre geocache is a logbook. The logbo0า cache and contributed to it. Match the words with the definitions. * a. an activity you enjoy doing in your free time * b. happening or beginning a short time ago 1. recent If you're inter yourself. Lo set off on ye time to join in seeing what 1 e for nearby ge. heocaching ad- 2. category 3. outdoor * C. to give something in order to provide or achieve something * d. happening in a place that is outside * e. to go around a place you've never been to before * f. a group of people or things that are similar 4. pastime 5. exploration : 6. target ompre, Lsion 7. contribute * g. a secret supply of something put in a container * h. an object that is shot at during shooting practice 6 Circle trg ปse. 8. cache

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