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自然科學 大學

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.

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英文 高中

請問14題為什麼是a?印象中while後面應接ving?

(B) Have you ever pondered how you got your name? Few of us would answer "yes" since we 11_our naming traditions that we usually take them for granted. Actually, naming traditions vary from country to country. Some distinct differences 12__ customs can be easily spotted between Chinese culture and Western cultures. First of all, Chinese people tend to keep their family names from generation to generation while in many Western countries surnames often change, 13 is the reason why there is a wider range of them. Furthermore, Chinese and Western people show respect for their elders and ancestors in different ways. 14 do not pass on their given names, 14 the latter sometimes name their children after an ancestor. In cultures 15 family links are indicated in names, some unique rules exist. In Iceland, a person's last name usually comes directly from the first name of the father. For instance, a boy named Erik 16 a father named Lars would be named Erik Larsson. Lars's daughter, Kristin, would go by the name of Kristin Larsdottir. 17_, the vast majority of Icelandic names end in either "son" or "dottir." For the Yami people of Taiwan, the son does not take the name of the father, 18_, the father changes his name 18_ the birth of his first son. Additionally, the boy's grandfather's name is changed too. A 11. (A) are so used to (B) used to (C) got so used to (D) use to 12. (A) regards (B) regarding names (C) regarding naming (D) regards naming (B) which (C) it (D) what (A) The former; while B) The first; but (C) The former; however D) The first; yet nes CD B 13. JA) that AC

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英文 高中

請問一下第七題我要怎麼知道這題是考分詞片語ㄚ

HALJNE 柯這 綜合測驗在指考占分 10%。充足的練習可以幫助同學掌握命題模式: 文章主題的練習題,並逐題講解,請同學多用心。 Focus FocuS 學習焦點 gationem I、文藝與歷史 dindo ao lobo TCH Milton S. Hershey did not achieve his goal the first time when he started his busi fact, he tried and failed five times before he could really make his candy business advice from Hershey's mother was the reason why he never gave up. She told him t 3. he did. (B) open D B A3 A 4. (A) succeed in until he mastered it. And that was exactly 4. his Because of his hard work, determination, and wisdom, Hershey did Apart from making money, he also took good care of his workers. Around his fa 6. built a town 5. nice homes, schools, and golf courses. He believed that important than making money. Since he and his wife had no children, he started a orphans in 1909. Children 7. four to fourteen lived and studied at the school. M Hershey's chocolate paid the bills. 1. (A) offer (C) refuse (D) work 2. (A) apply for the job (B) have an abundant supply (C) have more schooling (D) stick with something 3. (A) what (B) where (C) which (D) how (B) success of (C) successful in (D) successic D 5. (A) had (B) of (C) to have (D) with 6. (A) being surrounded (B) going into business (C) setting out on his own (D) treating his workers well 7. (A) age B (B) aged (C) aging (D) were ago ( 160) 相關照SO一英文

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