4. what will happen to the pitch of a sound as that sound’s source approaches an observer? explain why this happens, based on what you have learned about wave properties. use 3 content related sentences. (ref: p.382-387)
5. if a musical instrument such as a trumpet or flute is “flat”, should the pipe be lengthened or shortened? explain with at least 2 content related sentences. (ref: p.418-427)
6. a train is moving at 23 m/s due east when it sounds a blast on its horn, frequency = 164 hz. what frequency is heard by the driver of a car moving due east at 15 m/s along a road parallel to the tracks? use 343 m/s for the speed of sound. show all work. (ref: p.410-417)
enter the appropriate word(s) to complete the following statement.
7. a green object will absorb light and reflect light.
(ref: p.447-455)
8. a laser beam from earth is reflected back from a mirror on the moon in 2.60 s. if the distance between earth and the moon is 3.85 × 108 m, calculate the speed of light. show all work. (ref: p.438-446)
9. explain how the diffraction of light shows that light behaves like a wave. use 3 content related sentences. (ref: p.447-455)
10. a 20.0 cm tall object is placed 50.0 cm in front of a convex mirror with a radius of curvature of 34.0 cm. where will the image be located, and how tall will it be? show all work. (ref: p.471-481)
11. explain why convex mirrors can only produce virtual images. use at least 2 content related sentences. (ref: p.471-481)
12. a mirror has a magnification of -2.5. explain what this means in terms of the object produced. use at least 2 content related sentences. (ref: p.471-481)
13. tom’s father is 48 years old. he is not able to see nearby objects clearly. (ref: p.508-511)
a. what may be the reason for his vision problem?
b. where are images formed in this type of defected vision?
c. how is this defect corrected?
14. why does chromatic aberration occur? use 3 content related sentences. (ref: p.500-507)
15. light passes from air into water at an angle of 40.0° to the normal. what is the angle of refraction? show all work. (ref: p.492-499)
16. why does the pattern of colors repeat in a thin soap film? use 2 content related sentences. (ref: p.522-530)
17. radio waves can bend around buildings. an x-ray technician stands behind a wall during the use of her machine. what does this tell you about the relative wavelengths of these two types of invisible light? use 2 content related sentences. (ref: p.531-539)
18. what does it mean when white light is diffracted and at a particular location the color seen is blue? use 2 content related sentences. (ref: p.531-539)
identify each of the following as a conductors or insulators. (ref: p.548-552)
19. cloth
20. dry wood
21. tap water
22. glass
23. a positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread as shown below. after being charged once, the plates are disconnected from the battery. describe the behavior of the ball. use 3 content related sentences.
(ref: p.553-561)
24. air is an insulator. however, in winter you might experience a spark when your fingers touch a doorknob. briefly explain why this happens. use 2 content related sentences. (ref: p.548-552)
25. three positive charges a, b, and c, and a negative charge d are placed in a line as shown in the diagram. all four charges are of equal magnitude. the distances between a and b, b and c, and c and d are equal. (ref: p.553-561)
a. which charge experiences the greatest net force? which charge experiences the smallest net force?
b. find the ratio of the greatest to the smallest net force.
26. a rubber rod can be charged negatively when it is rubbed with wool. what happens to the charge of the wool? (ref: p.548-552)
27. the electric field around a positive charge is shown in the diagram. describe the nature of these lines. use 2 content related sentences. (ref: p.570-576)
28. why is it a good idea to touch a metal pole, or similar conductor, before filling up a car with gas? use 2 content related sentences. (ref: p.577-587)
29. compare and contrast electric potential energy and electric potential difference? use 2 content related sentences. (ref: p.577-587)
30. what is electrical power in terms of current and potential difference? (ref: p.598-608)
31. generate an explanation for the following formula: p = i2r (ref: p.609-613)
32. holiday lights are often connected in series and use special lamps that short out when the potential difference across a lamp increases to the line voltage. generate an explanation why and explain why these light sets might blow their fuses after many bulbs have failed. use 3 content related sentences. (ref: p.624-634)