9. An engine does 15 kJ of work while exhausting 37 kJ to a cold reservoir. What is the efficiency of the engine?
(A) 28.8 %
(B) 38.8 %
(C) 68.8 %
(D) 88.8 %
(E) 98.8 %

5. The figure shows a standing wave pattern in a string. What is the wavelength of one of the component traveling waves? (A) 10 cm (B) 20 cm (C) 40 cm (D) 60 cm (E) 120 cm

6. The figure shows four situations in which a source of sound S and a detector D are either moving or stationary. The arrows indicate the directions of motion. The speeds (when not zero) are all the same. (Note that the detector in situation ③ is stationary). Rank the situations according to the apparent frequency of the source, lowest to highest. (A) ①,②,③,④ (B) ④,③,②,① (C) ①,③,②,④ (D) ②,①,④,③ (E) ②,①,③,④

7. What is the deterministic factor of a sound wave for the sound pitch? (A) amplitude (B) frequency (C) phase (D) speed (E) intensity

8. A sample of an ideal gas is taken through the cyclic process abca shown in the figure. The scale of the vertical axis is set by = 15 kPa and = 5 kPa. At point a, T = 200 K. What is the temperature of the gas at point c? (A) 400 K (B) 600 K (C) 1419 K (D) 1800 K (E) 4258 K

10. The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T that are perpendicular to the page. A set of directions A through H is shown next to the figure. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of ______.  (A) A (B) E (C) F (D) G (E) H

11. Consider radio waves (r), visible light (v), infrared (i), X-rays (x), and ultraviolet (u). In order of increasing frequency, they are ______. (A) r, v, i, x, u (B) r, i, v, u, x (C) i, r, v, u, x (D) x, u, v, i, r (E) r, i, v, x, u

12. An erect object is in front of a convex mirror a distance greater than the focal length. The image is ______. (A) real, inverted, and smaller than the object (B) virtual, inverted, and larger than the object (C) real, inverted, and larger than the object (D) virtual, erect, and smaller than the object (E) real, erect, and larger than the object

13. The major physics principle that supports endoscope is ______. (A) refraction of light (B) diffraction of light (C) interference of light (D) scattering of light (E) total internal reflection of light

14. If we increase the wavelength of the light that falls on the metal in a photoelectric-effect experiment, which of the following will happen? (A) The work function of the metal increases. (B) The cutoff frequency decreases. (C) The stopping potential decreases. (D) The time delay of the emission of photoelectron increases. (E) All of the above.

15. For the particles listed below with the same kinetic energy, which has the shortest wavelength? (A) electron (B) positron (C) proton (D) ? particle (E) neutron