年級

問題的種類

英文 高中

請問第2題為什麼選A,其他選項不行嗎

e 30 ng e 三、綜合測驗(共0分,每題0分) 28 1. In Helsingborg, a small city on the coast of southern Sweden, 72 people have been chosen to take part in a social experiment. The name of the project is Sällbo, a combination of the 10 Swedish words for a group of companions and living. The goal is to bring the young and the old closer together. All of the _1_ live in the same apartment building. Both groups of residents must sign a contract agreeing to spend two or more hours a week with someone from the other generation. The project, launched in 2019, is run by a housing company and was embraced by the city government, 2_ provided the funds. All of the tenants have their own apartment, but they can also use shared areas of the building, which are designed to encourage social interaction. There is a gym, a living room, a crafts room, and a kitchen area, so both generations can live _3__ and enjoy activities together. Thanks to the design of the building, it is also easy for the young residents to check on their elderly neighbors. Y Modul cu- loig em_4_, the aim of the project was to help the elderly feel less lonely. However, the Sällbore team soon realized that many young people were also _5__ from the friendships they had formed with the older residents. Take a look at the bonds created between the two generations in the Sällbo project. We should try to bring generations together rather than keep them apart. Han Bho (1)(B) (A) relatives (B) participants (C) engineers (D) secretaries o abogdan (2) A (A) which (B) that (C) what (D) it JOM (3)(O)(A) in a row (B) in return (C) side by side (D) step by step (4)(O)(A) Enthusiastically (B) Oddly (C) Substantially (D) Initially (5)(#(A) benefiting (BVexceeding (C) proposing (D) budgeting teach alopov (ob de zima as a mi sdt ? man Estonia menang

已解決 回答數: 1
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.

待回答 回答數: 0