                        EOC Goal 7
Accessed 10 June 2017 at http://www.NCpublicschools.org
released October 2004

 A B C D
1. What is the velocity of a wave with a period of 1/400 seconds and a wavelength of 0.870 m?
1. 87.0 m/s
2. 300. m/s
3. 348 m/s
4. 400. m/s
 A B C D
2. Doubling the wavelength of sound traveling through air has what effect on the frequency?
1. The frequency is lower.
2. The frequency is higher.
3. The frequency is the same.
4. The frequency is lower or higher.
 A B C D
3. If a tuning fork vibrates at 336 Hz, what is the approximate wavelength of the sound it produces in air at STP?
1. 0.1 m
2. 1 m
3. 4 m
4. 10 m
 A B C D
4. An increase in the frequency of a sound wave will result in which of the following?
1. an increase in period
2. a decrease in wavelength
3. an increase in wave speed
4. a decrease in amplitude
 A B C D
5. What is the frequency of a sound wave in air (at STP) whose wavelength is 0.92 m?
1. 360 Hz
2. 280 Hz
3. 1.1 Hz
4. 0.0030 Hz
 A B C D
6. What characteristic do red, yellow, and violet light have in common?
1. wavelength
2. frequency
3. velocity
4. energy
 A B C D
7. A 440.-Hz sound wave passes from air where its velocity is 343 m/s to water where its velocity is 1,430 m/s. What is the change in wavelength?
1. 0.780 m
2. 2.47 m
3. 3.26 m
4. 4.04 m
 A B C D
8. Sound waves travel the fastest through which material?
1. copper
2. air
3. water
4. rubber
 A B C D
9. When white light passes through a prism, it breaks up into its component colors as represented in the diagram below. Which statement best explains this phenomenon?
1. The component colors have different speeds in the prism.
2. The component colors have different angles of incidence.
3. The component colors have different amplitudes in the prism.
4. The frequency of each component color in the prism is different from its frequency in air.
 A B C D
10. A student is standing 0.5 m from a plane mirror. The resulting image is best described by which of the following?
1. upright, real image, same size
2. upright, virtual image, reduced size
3. upright, real image, reduced size
4. upright, virtual image, same size
 A B C D
11. When an object is placed 10. cm away from a concave mirror of focus 5.0 cm, at what distance will the image be formed?
1. 5.0 cm
2. 10. cm
3. 15 cm
4. 20. cm
 A B C D
12. Light travels through air and enters fused quartz. The refracted angle is 36.2°. What is the angle of incidence?
1. 59.6°
2. 51.4°
3. 25.5°
4. 23.9°
 A B C D
13. An object is placed 40.0 cm in front of a converging lens with a focal length of 8.00 cm. What kind of image will be formed, and where will it be located?
1. real; 10.0 cm behind the lens
2. real; 10.0 cm in front of the lens
3. virtual; 10.0 cm behind the lens
4. virtual; 10.0 cm in front of the lens
 A B C D
14. A beam of red light enters a crown glass prism on the path shown. What is the angle of refraction?
1. 15.4°
2. 19.2°
3. 30.0°
4. 48.6°
 A B C D
15. An object is located 8 cm from a converging lens with a focal length of 5 cm. Which of the following best describes the image formed?
1. It is virtual and smaller than the object.
2. It is virtual and larger than the object.
3. It is real and smaller than the object.
4. It is real and larger than the object.
 A B C D
16. In the drawing below, pulses Q and R are traveling down a rope attached to a rigid barrier. When the reflection of R interferes with Q, what will the rope look like?
1. 2. 3. 4. A B C D
17. A fire truck with a siren blaring approaches a student. How does the sound heard by the driver of the fire truck compare to the sound heard by the student?
1. The driver hears the same frequency, and the student hears a lower frequency and then a higher frequency.
2. The student hears a higher frequency than the driver.
3. The driver hears a higher frequency than the student.
4. The driver hears the same frequency as the student. Additional North Carolina Exam Questions