28. Which of the following statements about mass spectrometry is correct? 

Ⅰ.The ions are separated based on their charge-to-mass ratio. 

Ⅱ.Chemical ionization produces more fragmentation than electron ionization.
Ⅲ. Mass spectrometry can be used to accurately measure small differences in isotopic abundance.
(A) I and II only
(B) I and III only
(C) II and IiI only
(D) III only
(E) I only

29.Which of the following statements associated with collision theory is incorrect? (A) More collisions correspond to a faster reaction rate. (B) It is assumed that the reactant molecules are hard spheres. (C) The potential energy and orientation govern the occurrence of collisions between reacting particles. (D) Collisions can oceur between atoms, ions, and molecules. (E) The Arrhenius equation gives the correlation between the rate constant k and temperature T.

30. The jonization energy of H is 13.6 eV. The first and second ionization energies of He will be approximately (A) 5 eV and 14 eV (B) 5 eV and 54 eV (C) 14 eV and 24 eV (D) 14 eV and 34 eV (E) 24 eV and 54 eV

31. Two bodies, A and B, collide as shown in Figures I and II below. Which statement is true?(A) They exert equal and opposite forces on each other in both I and II. (B) They exert equal and opposite forces on each other in II but not in I. (C) They exert equal and opposite forces on each other in I but not in II. (D) The forces are equal and opposite to each other in I, but only the components of the forces parallel to the velocities are equal in II. (E) The forces are equal and opposite in I, but only the components of the forces perpendicular to the velocities are equal in II.

32.Two identical balls strike normal to a wall with the same velocity respectively. Ball A bounces backwards at the same speed. Ball B stops. Which statement correctly describes the change in momentum of the two balls? (A) |△pB|＞|△pAl (B) |△pB=|△pA|(C) |△pBI ＜I△pAl (D) △pB=△pA (E) △pB＞△pA

33. The circuit right contains three 100-W light bulbs. The emf ε = 220 V. Which light bulb(s) is(are) the brightest? (A) A (B) B (C) C (D) Band C (E) All three are equally bright

34. In an experiment, different wavelengths of light, all able to eject photoelectrons, shine on a freshly prepared (oxide-free) zinc surface. Which statement is true? (A) The number of photoelectrons emitted per second is independent of the intensity of the light for all the different wavelengths. (B) The number of photoelectrons emitted per second is directly proportional to the frequency for all the different wavelengths. (C) The maximum kinetic energy of the photoelectrons has a linear relationship with the frequency for each wavelength present. (D) The maximum kinetic energy of the photoelectrons emitted is directly proportional to the frequency for each wavelength present. (E) The maximum kinetic energy of the photoelectrons is proportional to the intensity of the light and independent of the frequency.

35 Equal volumes of hydrogen and helium gas are at the same pressure. The atomic mass of helium is four times that of atomic hydrogen (H). If the total mass of both gases is the same, the ratio of the temperature of helium (He) to that of hydrogen (H2) is T(He)/T(H2) = (A) 1/4 (B) 1/2 (C) 1 (D) 2

36. A block of material of mass m and specific heat c falls from height h and reaches speed v just before striking the ground. Its temperature is measured immediately after it strikes the ground. If we ignore any change in temperature owing to interaction with the air, the change in temperature of the block of material is(A) (B) (C) (D) All of the answers above are correct (E) Only ( A ) and ( B ) above are correct

37. The work done in the expansion of a gas from an initial to a final state of a thermodynamic process (A) is the area under the curve of a PV diagram (P and Vindicate the pressure and volume of the gas) (B) depends only on the end point (C) is independent of path (D) is the slope of a PV curve (E) equals P(VF -Vi) 

38. What is the magnitude of the magnetic field at point P if a = R and b = 2R? (A) (B)(C)(D)(E)

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