1. The speed of sound in a certain metal block is 4.00 x 103 mts. The graph shows the amplitude (in meters) of a wave traveling through the block versus time [in milliseconds]. What is the wavelength of this wave? l h 0.5 v 2.5 v 4.5 ,(ms) _1 (a) 5.0 m (cl 200 m (b) 20.0 m (d] 8000 m 2. If you reduce the linear density of a string by half. the velocity of a wave on the string (a) doubles {d} quadruples (b) is cut in half (3] increases byJE [c] decreases by JE 3. Which one of the following statements concerning waves is true? (a) Sound wave is a pressure wave and carries particles from one place to another. (b) A wave can have both transverse and longitudinal components. to) The wavelength of a traveling wave is determined by the source of disturbance. [de A transverse wave is one in which the disturbance is parallel to the direction of travel. 4. A wave moves at a constant speed along a sting. Which one of the following statements is false concerning the motion of particles in the string? (a) The particle speed is not the same as the wave speed. (b) The particle moves one wavelength distance in one period. [c] The particle speed depends on the frequency of the periodic motion of the source. (d) The particle speed is independent of the tension and linear density of the string. 5. Sound intensity is an objective property of sound. The subjective quality related to this is: (a) amplitude (c) decibels (b) pitch {d} loudness 6. An echo is sound that returns to your after being reected from a distant surface {e.g., the side of a cliff]. If the distances involved are the same. an echo under water and an echo in air retum to you . (a) at different times. the echo in air returning more quickly (b) at different times. the echo in air returning more slowly to) at the same time. T. Which of the following statements is correct if you triple the distance between yourself and a speaker? Assume the sound spreads out uniformly in all directions and there are no reections of the sound waves. (a) The sound intensity would decrease by a factor of 3. (b) The sound would seem to be 3 times less loud as before. (c) The sound intensity level would decrease by 4.??? dB. [de The sound intensity level would decrease by 9.54 dB. [6) None of the above. 8. Whim one of the following statements conoeming the wavelength of an electromagnetic wave in a vacuum is true? (a) The wavelength is independent of the speed of the wave for a xed frequency. (b) The wavelength is the same for all types of electromagnetic waves. [c] The wavelength is inversely proportional to the frequency of the wave. [de The wavelength is directly proportional to the ti'equency of the wave. 9. .which one of the following phrases most accurately describes the term wame hunt? (a) the surface of a plane mirror (b) the surface of a convex mirror [c] a surface upon which a wave is incident (d) a surface of constant phase within a wave (a) a surface that is parallel to the direction of wave propagation 10. Two plane mirrors are separated by 120. as shown below. If a ray sh'ikes mirror M1 at a 55 angle of incidence, at what angle 9 does it leave mirror M2? [a] 25 (b) 35 (c) 55" [d] 60 (3] 65 11. The radius of curvature of a spherical convex mirror is 52 cm. What is its focal length? (a) +26 cm (b) 26 cm (c) +52 cm [de 52 cm [6) +104 cm 12. Five balls labeled A, B, c. D, and E are placed in front of a plane mirror as shown in the gure. Which ball(s] will the observer, in the position shown, see reected in the minor? Plane 1mm A Q B. C . D. E. (a) A only [d] A, B, D and E (b) C only [a] A. B,C. Dand E [c] A and B 13. Which one of the following statements concerning a convex minor is true? (a) A convex minor can form a real image. (b) A convex minor must be spherical in shape. [c] The image produced by a convex minor will always be inverted relative to the object. [de A convex minor produces a larger image than a plane minor does for the same object distance. (e) The image a convex minor produces is closer to the minor than it would be in a plane minor for the same object distance. 14. A concave minor has a radius of curvature of 60.0 cm. How close to the minor should an object be placed so that the rays travel parallel to each other after reection? is) 10.0cm (b) 15.0cm (c) 30.0 cm [de 45.0 cm (s) 60.0 cm 15.Which one of the following statements concerning the index of refraction for a given material is true? (a) For a given frequency, the index of refraction is inversely proportional to the wavelength of light in vacuum. (b) For a given frequency, the index of refraction is inversely proportional to the wavelength of light in the material. [c] The index of refraction may be less than 1. (d) The index of refraction may be measured in nanometers. 15. The bending of light as it moves from one medium to another with differing indices of refraction is due to a change in what property of the light? (a) amplitude lb) Period (c) frequency (d) speed (s) color 17. Complete the following statement: The term dispersion refers to the fact that the index of refraction of certain materials (a) depends on the angle of refraction. (b) depends on the wavelength of light. (c) depends on the angle of incidence. (d) depends on the intensity of light. 13. The drawings show two examples in which a ray of light is refracted at the interface between two liquids. In each example the incident ray is in liquid A and stlikes the interface at the same angle of incidence. In one case the ray is refracted into liquid B, and in the other it is refracted into liquid C. The dashed lines denote the normal to the interfaces. Rank the speeds of light traveling in these three liquids in ascending order {smallest first). (a) \"A! V3, \"C [d] \"C: \"B: \"A (b) T"sh \"A: V: [e] \"c: \"A: T"s (C) 1's: \"c: \"A 19. In a scene from a movie, a nearsighted character removes his eyeglasses and uses them to focus the nearly parallel rays of the sun to start a re. What is physically wrong with this scene? (a) Sunlight cannot be used to start a re. (In) The eyeglasses have converging lenses and cannot be used to focus parallel rays. (c) Parallel rays cannot be focused. (d) The eyeglasses have diverging lenses and cannot be used to focus parallel rays. (e) A re can only be started if the image is virtual. 20. An object is more than twice the focal length of a camera lens away. Which is necessarin true about the image? (a) It is inverted. smaller and real. is) It is upright, larger and virtual. (b) It is inverted. larger and virtual. (d) It is upright, smaller and real