15. Which of the following statements on a wave functionφ(x,t) in quantum mechanics is correct?
(A) The probability of finding the particle in region
(B) The wave function can be determined via a series of measurements.
(C) Since it is not a function of velocity, it does not carry the information of momentum.
(D) All of the above.
(E) None of the above.

11. Which of the following statements on radioactive decays is true? (A) The rate of decary is proportional to the number of undeeayed substance. (B) The rate of decay  is proportional to the half-life of the undecayed substance. (C) The decay constant is proportional to the half-life of the undecayed substance. (D) The half-life of a substance decreases with time. (E) None of the above. 

12. A force produces potential U(x) = ax4. where a = 1.43 J/m4 . What is the force and direction when the particle is at x = -0.78 m? (A)ON (B)-0.67 N (C) 0.67N (D) -2.7 N (E) 2.7 N

13. In vacuum, an electromagnetic wave traveling along the x axis has an electric field and a magnetic field whose magnitudes depend on x and t asE(x,t)=E0sin(kx一ωt),B(x,t)=B0sin(kx-ωt+Φ), where E0 and B0 are the amplitudes of . Which fact below is correct? (A) (B)The directions of  and   are arbitrary once they are perpendicular to x. (C)Φ=π/2 (D) ωk =c (E)This is a linearly polarized wave.

14. Which statement regarding total internal retlection is not true? (A) It cannot occur when the incident light is in the medium of lower index of refraction. (B) Total internal reflection oceurs for rays with their incident angles greater a critical angle. (C) It explains the phenomenon that the water-to-air interface looks like a mirror when an observer is in water. (D) It is used in transmission through optical fibers. (E) The effect is used to realize polarizers.

16. Which type of titration is used to determine the concentration of calcium ions in a sample? (A) Acidity Titration (B) Alkalinity Titration (C) Redox Titration (D) Complexometric Titration (E) Ionic Strength Titration 

17. Which of the following is a cyclic organic compound with four nitrogen atoms? (A) Tetrazine(B) Diazine (C) Triazine (D) Benenze (E) None of the above

18. Which of the following organic compounds with the sum formula CroH4 exhibits two singlets in the 'H NMR spectrum and three signals in the 3C NMR spectrum?(A)(B)(C)(D)(E) None of the above

19. What type of bonds hold the monomers in a typical polymer like PP together? (A) Ionic bonds (B) Hydrogen bonds (C) Covalent bonds (D) Hydrophobic interaction (E) Van der Waals interaction

20. Which of the following amino acids has a positively charged side chain under physiological conditions? (A) Alanine (B) Asparagine (C) Glutamine(D) Aspartate (E) Arginine

21. Determine the ligand field stabilization energy of [Rh(H2O)6]3+. (A)0△o (B) -0.4△o (C)-1.9△o (D) -2.0 △o (E) -2.4 △o