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รายงานการทดลอง M1 หน้า 6 ปัญหาท้ายการทดลอง (Problems) inch 2 2 5 7 8 cm จากรูป ถ้าใช้เวอร์เนียร์คาลิเปอร์ ในหน่วย เซนติเมตร(cm) ความยาวหนึ่งช่องสเกลหลัก(Main scale) คือ S = Cm จำนวนช่องของสเกลเวอร์เนียร์(Vernier Scale) คือ n = ช่อง ค่า Least Count คือ L.C. (สมการ) = (แทนค่า) (ผลลัพธ์) (หน่วย) ค่าความยาวที่อ่านได้ คือ L (ผลลัพธ์) (หน่วย) จากรูป ถ้าใช้เวอร์เนียร์คาลิเปอร์ ในหน่วย นิ้ว(inch) ความยาวหนึ่งช่องสเกลหลัก(Main Scale) คือ S = inch จำนวนซ่องของสเกลเวอร์เนียร์(Vernier scale) คือ n = ช่อง ค่า Least Count คือ L.C. .(สมการ) ..(แทนค่า) (ผลลัพธ์) ...(หน่วย) ค่าความยาวที่อ่านได้ คือ L (กระจายในรูปเศษส่วน) (ผลลัพธ์เฉลี่ยในรูปทศนิยม) ..(หน่วย) น

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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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Unit check 1 Filแin the blanks Complete the text with the words in the box. กราฟทีที่ จพานาการ ) decorate garbage graffiti imagination knitting upcycle urban ya cans ในมือง Our school has a really cool art club, VWe meet every Wednesday after school in the art roon กษาพ on our projects. There are many different kinds of projects. One group is working Wถก Some very uทusual scarves. Another group is studying yarn and think that it's a form of 3 around the city. They hallways in the school with graffiti art. Im in what they call the 5 art. The principal is going to allow them to one of the that people are putting in their garbage group. We Collect old stuff Everyone in the group has a lot of 3 and recycle or They have lots of great ideas. it into a works of art. 8 2 Choose the CorPect answers Circle the correct answer: a, b or c. 1 Right now Harry for fingerprints on his cell phone. He wants to find out who's using it. a looks for b(s looking for c looking for 8 Ugh! That is coffee 've ever tasted. a the worst b the bad c the Worse 9 Do you think that English is 2 Dont call Jim at 9:00 p.m. on Fridays. He always language than Chinese? Dancing Stars at that time. a an easier b the easiest C easier a is watching 6 watch C watches 8 3 1 dont always enjoy in the morning 3 Vocabulary but I do it for my health. Underline the correct words. a to jog b jog c jogging Hey, we have to figure / check/ give out that new malL. It has hundreds of stores. 1 4 A taxi driver a map of the city in his head 2 Do you think Im too old to give / look / take up the violin? and know where everything is. a has to have b have to have 3 To become a professional architect / flight attendant / pilot, you have to have a lot of experience in flying planes. 4 The doctor / dentist / lawyer is going to check your teeth. C don't have to have 5 When we home, we tired so we right to bed. a get/was/went b got/were/went C got/were/go 5 Apples / Eggs / Onions are my favorite fruit. 6 Ask the teacher to give you for your essay. 6 Would yoน like some ice cream for appetizer / main course / de5sert? idea C Some ideas a Some idea b any 7 He dropped / fell / picked up his ice 7 He said this was a ham and cheese sandwich, but it cheese in it. Cream on the sidewalk. doesnt have C Some a many b any 6 Hกw did voม d0? Review Unit lagain OK

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