求解答案是否正確

Multiple-choice questions: (70 points) write the letter of statement that is not true: 1. A.B.U The Drude Model: (a) It is a classical approach using concepts from the kinetic theory of gases. (b) A relaxation-time approximation is used where the probability of collision is l/t. (c) No forces act on the electrons in between collisions. (d) It predicts accurately the electronic heat capacity of metals. 2. The Sommerfeld Model: (a) The crystal potential is replaced by an average Coulomb potential. (b) The separation of states is so close that a continuum model can be applied. (c) The electrons are highly localized due to a strong crystal potential. (Q) The energy of the highest occupied state at 0 K is the Fermi energy. 3. Density of states in k-space, N(k): (a) N(k) is determined by the boundary value conditions. (b) For lattices in any dimensions, N(k) is constant in k-space. (C) N(k) depends on the direction and magnitude of k. (d) It is directly proportional to the volume of the crystal. E影響, c 4. The Fermi surface of a metal: (a) is responsible for many of the transport properties of the metal, (b) depends on the nature of the chemical bonds, (c) is always a sphere, (d) can involve mixing of electron orbitals. ✓ 5. The conductivity of a material () increases with the mobility of its carriers, (b) increases with the density of carriers, (C) it is inversely proportional to the energy gap. cogu changes with temperature. 6. BID Plasmons: (a) They are an important characteristic of the Sommerfeld electron gas model. (b) Plasmons occur spontaneously in metals. (c) They are related to charge density oscillations. (d) The Plasmon energy is typically of the order of 10 eV. The Fermi energy Ef in intrinsic semiconductors 8) is usually close to y E, at OK (b) it ACiD. can increase or decrease with temperature depending on the ratio of hole and electron effective masses, (c) it represents the point at which the probability of occupation is 12, even though there may not been any states with that energy, (d) its value relative to the electronic bands must remain unaffected in the presence of defects or interfaces.

謝謝

Equilibrium constant calculations often have as much as 5% error X in them because (A)molar concentration and pressures are often used. (B)there is experimental error involved in measure K. (C)the chemical activity should be used. (D)approximation are often used to solve very difficult calculations. (E)all of the above. 【83 中興B)

請問一下哪裡可判斷出來是使用固定成長模式公式？

DIV2/P1= $1.25/$18.90 0.0661 = 6.61% 2. Stormy Weathers has no attractive investment opportunities. Its return on equity equals the discount rate, which is 10%. Its expected earnings this year are $4 per share, Fill the following table and show the calculation process." WANN Plowback Ratio- Growth Rate. Stock Price P/E Ratio a.- b. C. 0.4. e. f 0.8- h. i. Sol.- a. Plowback ratio=0) > DIV1 = $4 and g = 0. b. Therefore: Po P/E ratio= $40/S4= 10. = $40.00 0.10 - 0 d. Plowback ratio = 0.40 = DIV1 = $4(1 – 0.40) = $2.40 and g= 10% x 0.40 = 4% $2.40 Therefore: P. = $40.00 5 f. P/E ratio= $40/$4= 10. 0.10 -0.04 Plowback ratio=0.80 = DIV1 = $401 – 0.80) = $0.80 and 9= 10% x 0.80 = 8% P: x

想請問學霸們畫線的地方是什麼意思？（看得懂英文，不過他想表達的我就不懂啦~QQ)-大一入門微積分

Precise meaning of limit x->a For each € > 0 there is a 8 >0 such that 0 <|x - al<8 = \|(x) – Ll<ɛ 1.Prove that lim (3x – 7)= 5 x 4 Prove : Preliminary Analysis : Let ε be any positive number. We must produce a 8 >0 such that 0<fx - 4<= |(3x - 7)- 51 < digital do consider the inequality on the right |(3x – 7)-5/<ε = 3x - 12/<€ 3(x-4)<ɛ how blu 4< = |- - 131x - 4 <E (x-4 < 2 3 domen. szondo otworo Now we see how to choose 8, namely, 8 = Of course, any smaller 8 would work Toolmo Formal Proof : Let & > 0 be given. Choose 8 = . Then 0 < x - 4 <& implies

數學/統計學/共變異數/相關係數 想請問一下題目上的第三題要如何求算ಥ_ಥ （網路上查到的題型都是實數對實數，這裡是給一個範圍⋯而且求的是開架跟天數而不是兩區的差別） 附上上課給的範例嗚嗚嗚 麻煩了ಥ_ಥ謝謝各位

Question 2 (125) V2 某家位於美國中部小鎮之小型房地產仲介,現想瞭解物件自委託到買賣成立所需的時間。該 公司分析近近三年來成交的 800 筆資料,整理如下表。 成交所需天數 30 天以內 31-90 天 90 天以上 總和 $150,000 以下 50 40 10 100 6 6:125 $150,000-$199,999 20 150 開價 80 250 0,3125 $200,000-$250,000 20 280 100 400 05 $250,000 以上 10 30 10 50 總和 100 500 200 800 如果該公司簽下委賣合約,開價在$150,000 以下,則成交天數在90 天以下的機率 為何? b. 如果事件 A表示成交所需天數在90天以上,事件B表示開價在$150,000 以下, 請問事件A與B 是否為獨立事件?試說明之。 C. 假設該公司將800 筆數據又細分為東區及西區(兩區房價分佈相似),並統計在售價 區間的平均銷售天數,其結果呈現如下表。試算共變異數及相關系數,說明開價與平 均銷售天數有甚麼關係。 平均銷售成所需天數 0,0625 a. 東區 西區 PC62 37 42 54 66 開價 $150,000 以下 $150,000-$199,999 $200,000-$250,000 $250,000 以上 71 82 46 50 出S(新) 法制度信天名之戈登发 才有哪 and AND cing 0 .action 2 (104)

求救抽樣調查不知道這怎麼寫🙏

The picture is USA map. There are four area, containing N=51 states. The government wants to investigate death rate (death/confirmed) by covid-19 in USA. Asample of n=8 states is selected- How to design and carry outa sample survey for each ofthe following designs. a. Simple random sampling b. Stratified sampling c. Systematicl sampling d. Cluster sampling with stratified sampling In addition, to discuss and comparetheir population mean and bound onthe errorofestimation.

請問有人會第三部分嗎謝謝🙏

7 practical abilities: cl 尼 (LSIKLs 和 Match 1-8toa-htomake sentences7 人 SQ 1 Isalwaysqificult to allocate ag_ 卻志 2 You need to learn how to delegate 3 Ma二 like about my boss is she always lets me Set ck_ We're falling @ ILs difficult to stay within AA If wecontinue like this, we should meet 二廬 Hi, Melinda, it's Hanna, Ineed to getan Tm sure wedl be able to catch 襯_ Hedte司 六 b behind schedule, so we all need to work this weekend- update on how the project is progressimg,。 ~d_tasks-you cantpossibly do everything yourself, e up-there are three more weeks left。 f on with my workonmyowm. 潑 budget-wealways overspend- ~h thedeadline without too much trouble, %@swWuonem 3 Complete the email with the correctform of'words from 2. Dear Jan, jm afraid 上looks 由8 we are not going'to be able to meet the next Friday. We've fallen behind 2cjauue_ because we were not 3 SUffiGiG We need more 5 汪記 with ee appropriate'skills to be put on 了he DrGJeGt immediately. Of course, 了his does meanm 也at we wont be able to stay 了 our6_____either WilISSIIVOU # after our team meeting tnlS afternoon to let you know what iS deeiqledl- Very best wishes, Graham Lud 有

請問有人會第二部分嗎謝謝🙏

3 | Practice file Working with words IT PutftheIetters im brackets in the correctorder to make words thatmatch the definitions. 1 something available to exPploit and use: yesolerces- (ESCRORUSE) Sweulg_(csEHDLUE) 2 ftimetable of activities: 3 news onhow something is progressing: (UTEPAD) 4 money spending plan: bpe (BDTUGE) 5 thelast day for finishing a piece of work or projeetk NWZ/ (ADENDEL 6 working together: 0(EAWKTMRO) 7 practicalabilities:_<erlUe_(LSIKLS) 2 Match 1-8 to a-h to make sentenees7 SO 1 Itsalways difficult to allocate 4 炙訕 2 youneed to learn how to delegate 3 由 about my boss is she always lets me get 4 Were falling 1 5 Isdifficult to stay withim 人 6 HIfwecontinue like this, weshould meet 7 Hi Melinda, is Hanna,Ineed to getan 8 Tm sure we beable to catch 襯- p pehind schedule, so we all need to work tfhis weekend. update on how the project is progressing, ~d_tasks-you cantpossibly do everything yourself, \ 印- there are three more weeks left. f onwith my workonmyowrm 痊 budget-wealways overspend- ”h thedeadline without too much trouble, 3 Complete the email with the correct form OfWords from 2.

B部分求解

A 同踢3Circle the correctWOIOCS y is doing Very well. 目ls shrinking) fast. (Fewer and fewer /了ore and mor (increasing / df are shopping or wat&hirt health awarenes5-一一 3 leatout more often these days as the-qsalty of food in many restaurants has, gotten worse). 4 Unhealthy food choices such as fast food are causing health problems_llke_obe ity to become (less common / jmmore widespread. B8 Complete the sentences-ee cribing trends. Use your own ideas. has decreased in the last few yes 1 The number of people who has improved over time. 2 3 4 These days, fewer and fewer people is/are becoming less common nowadays,. is/are getting richer. has become more widespread inthe lasttte!際 5 6 The problem Of C Work with a partner. Do you agree with your partner's statements in B? Why or why not?

有人可以麻煩幫我看有沒有寫錯嗎🙏🙏

Busines5s comrmunmlecat or fora supermarket 選避1 is abuyer IT Rick Parry 15 凡 記全8 et tative ofakey supplier. fion with words from feeg7fF9#-f7#4e9 fojdf do ol do 7eye和77 ee-fojueef 1/olt 7 泌 ggz5 777CC 之 gg7zf 1 0 【///234 One of W2 1 CK Marcel, 」 4 2上全 our guest5. MarceL 3 Patti Kline. 5he works with Longridge,one ot our 宙他9 biggest suppliers. ry \ Ma cel ? 還 VGy le to imeet youu 1 iceto ice _、M9人一 , too. So Marcel, Wo _ GoMoxk_GS exactly? 2 反- 守eel WellL Tm in charge of all our stores in the south of England. 關代二?Thatmustbevery 毗戰din8. You know, alot of responsibility. dto talk to someone over there. seeing you, Pattt. Keep card