7. Because the ear is sensitive over a broad range of intensities, a logarithmic measure of intensity called sound intensity level is often used. The chosen reference intensity I₀ is approximately the threshold of human hearing at 1000 Hz. If the intensity of a sound wave equals 10 I₀, what is the sound intensity level in dB?
(A) -3
(B) 1
(C) 3
(D) 10
(E) 20

8. If a simple pendulum oscillates with small amplitude and its length is doubled, what happens to the frequency of its motion? (A) It doubles. (B) It becomes times as large. (C) It becomes half as large. (D) It becomes 1/times as large. (E) It remains the same.

9. Two long straight wires are mounted parallel to each other, with one wire directly above the other. Each wire has a weight per unit length of w = 2.0 × 10⁻⁵ N/m. The separation between the wires is d = 0.080 m. The wires carry currents that are equal in magnitude but opposite in direction. Find the current I in each wire. (Given: permeability constant μ₀ = 4π × 10⁻⁷ T·m/A) (A) 1.8 A (B) 2.4 A (C) 2.8 A (D) 3.2 A (E) 3.6 A

10. An electric dipole with a dipole moment magnitude of p = 5.0 × 10⁻⁶ C·m is placed in a uniform electric field of magnitude E = 2.0 × 10⁵ N/C. The initial angle between the dipole moment and the electric fieldis 60°. How much work must an external agent do to turn the dipole 180° from its initial position? (A) 0.5 J (B) 1.0 J (C) 1.5 J (D) 2.0 J (E) 0 J

11. Large aperture telescopes are used primarily to ______. (A) collect more light (B) reduce chromatic aberration (C) increase magnification (D) reduce diffraction limit (E) decrease focal length

12. An electromagnetic wave with a peak magnetic field magnitude of 1.5 × 10⁻⁷ T has an associated peak electric field of what magnitude? (A) 0.5 × 10⁻¹⁵ N/C (B) 2 × 10⁻⁵ N/C (C) 2.2 × 10⁴ N/C (D) 22 N/C (E) 45 N/C

13. If Josh's face is 30.0 cm in front of a concave shaving mirror creating an upright image 1.50 times as large as the object, what is the mirror's focal length? (A) 12.0 cm (B) 20.0 cm (C) 70.0 cm (D) 90.0 cm (E) none of the above

14. What is the energy of each photon produced by positron–electron annihilation? (c is the speed of the light; m₀ is the mass of electron at rest.) (A) 12 m₀c² (B) 6 m₀c² (C) 2 m₀c² (D) m₀c² (E) m₀c²

15. When beryllium Be is bombarded by α particles, radiation X will be emitted from the target material. The nuclear reaction can be expressed as α + ⁹₄Be → ¹²₆C + X. What is radiation X? (A) (B) (C) (D)(E) γ-ray

16. All of the following compounds are soluble in water except ______. (A) NaCl (B) CaCl₂ (C) FeCl₃ (D) NH₄Cl (E) PbCl₂

17. How many stereogenic centers are there in Lovastatin (Mevacor®, a cholesterol-lowering drug)? (A) 4 (B) 5 (C) 6 (D) 7 (E) 8

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