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複選題16. Consider a p-n diode. Which of the following statements are correct? (A) Electrons on the n side and holes on the p side will flow towards each other and recombine until all the carriers are neutralized. (B) When the diode is forward biased, both electron current and hole current will flow in the diode contributing to the overall current. (C) When the diode is reverse biased, the current in the diode is essentially negligible if there is any. (D) A good quality diode can be easily formed by mechanically compressing p- and n- type semiconductors into close contact. (E) All of the above.

複選題15. Consider energy bands in a crystal. Which of the following statements are correct? (A) The conduction band of a metal is partially filled by electrons. (B) Existence of energy gap is a manifestation of quantum mechanical phenomenon. (C) Intrinsic semiconductors cannot conduct electricity at all even at high temperatures. (D) Doped semiconductors can conduct electricity primarily with the carriers in the conduction band or holes in the valence band. (E) All of the above. 注

複選題14. You want to calculate electron waves 4(x) in a thin wire (1-dimensional). What if the potential outside the wire were infinite? Which of the following statements are correct in this scenario? (A) The allowed kinetic energies of electrons should be quantized. (B) (x) 0 everywhere000 eV (C) (x) ≈0 everywhere, except for 0＜x＜L. 이 L (D)y(x) = 0 everywhere, except for 0＜x＜L (E) Can't tell anything yet. Need to find y(x) first. mathematically V(x) = ∞ for x＜0 and x＞L V(x) = 0 eV for 0＞x＜L

(B) Consider the Bohr Hydrogen atom model, assume that condition for orbit stability is h nλ = 2π r where 1 = .Show that the Bohr Hydrogen atom model's Energy levels is mv me1 E=-8ɛh² n²

Problem 18: (A) Consider the Rutherford Hydrogen atom model as following figure, show that the total energy of e² hydrogen atom is E =40318質子 +e F e F電子

(C) Derive the time-independent (space) part of one dimensional Schrodinger's equation.

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描述：1

23. What final product would be obtained from following reaction??

26. 測試操舵試驗，在正舵(midship)的舵角容許偏差為多少度？ (A) 0 (B) ± 1 (C) ± 2 (D) ± 3

15.根據價殼層電子對互斥理論(Valence Shell Electron Pair Repulsion，VSEPR)，XeF₂的分子形狀為何？ (A)直線形 (B)彎曲形 (C) T 形 (D)四面體形

6.有關急性胰臟炎的敘述，下列何者正確？ (A)因膽道疾病導致膽汁與胰液逆流而引起 (B)穆菲氏徵象（Murphy’s sign）是常見表徵 (C)康復期應採高脂飲食 (D)血清中鈣濃度通常會升高

7.有關口服膽囊攝影檢查（oral cholecystography）的敘述，下列何者正確？ (A)檢查前需採低脂飲食 (B)急性膽囊炎為適應症之一 (C)檢查前30分鐘服下含碘顯影劑 (D)檢查後若排尿有燒灼感代表出現泌尿道感染

8.有關口腔癌的敘述，下列何者正確？ (A)發生部位以上顎黏膜最多 (B)以鱗狀上皮細胞癌最常見 (C)咀嚼不順為常見早期徵象 (D)口腔有無痛且不易癒合的潰瘍為常見晚期徵象