Waves: Sound & Light Unit Test Study Guide KEY



Name _____________________ Date __________ Class Period ___ Waves: Sound & Light Unit Study Guide

1. Waves transfer ________________ .

2. Which of the following types of waves requires a medium: microwave, visible light, sound waves or x-rays?

3. If a wave is traveling at a certain speed and its frequency is doubled, what happens to the wavelength of that wave?

4. A wave can make a leaf bob up and down on the water, but it cannot move the leaf toward the shore. This is because waves only transfer ________________ .

5. Which of these waves do NOT require a medium? Sound, ocean, radio, or seismic.

6. Which of the following is NOT a property of a wave? Amplitude, frequency, wavelength, or medium

7. An echo is the result of a________________ sound wave.

8. A section of a longitudinal wave where the particles are crowded together is called a ________________.

9. When the crests of one wave overlap the crests of another wave or waves, this occurs: ________________.

10. Part of a longitudinal wave where the particles are spread apart is called is called a ________________.

11. Which of the following waves is an example of a mechanical wave: light, x-ray, radio, or ocean wave?

12. What unit is used to describe the frequency of a wave?

13. Why do sound waves travel around corners better than light waves?

14. A substance through which a wave can travel is a ________________ .

15. The amplitude of a sound’s waves determines the sound’s ________________ .

16. The motion of either the listener or the source of a sound causes the ________________ .

17. The frequency of a sound wave determines the ________________ of the sound.

18. The ________________ through which sound waves travel affects the speed of the sound.

19. Which person will experience what happens to sounds due to the Doppler effect? Two friends riding bicycles side-by-side and talking; a father pushing a laughing toddler on a swing; a boy sitting and watching television; a girl running and listening to her radio through earphones.

20. Which sound has the highest pitch? 156 Hz; 258 Hz; 14 dB; 563 dB

21. ________________ waves are produced by the vibration of an electric field and a magnetic field together.

22. The electromagnetic spectrum is divided into regions by ________________.

23. What wave interaction occurs when waves combine and the resulting wave has a greater amplitude than the individual waves had?

24. What wave interaction occurs when waves combine and the resulting wave has a smaller amplitude than the individual waves had?

25. Whether an object is transparent, translucent, or opaque is determined by its ability of light to ________________.

26. When white light is refracted, the amount that the light bends depends on the ________________ of the color.

27. What kind of waves are used in radar for detecting the speed of a car?

28. What kind of waves can be used to treat some cancerous tumors?

29.When you increase the frequency of a sound wave…

a. the period will also increase. c. pitch will decrease.

b. the period will decrease . d. loudness will increase.

30.Mechanical waves can NOT transport…

a. energy c. matter

b. material d. answers b and c are correct

pared to the speed of light, sound travels…

|a. |faster. |

|b. |at about the same speed. |

|c. |slower. |

Answer questions 32 – 34 based on the wave-form below. The wave was produced when a student sings a tune for 0.03 seconds. Assume the speed of sound in air is 320 m/s.

32.How many full waves are there?

a. 11 b. 12 c. 13 d. 6

33.What is the waves frequency?

a. 400 hz b. 366 hz c. 120 hz d. 40 hz

34.What is its wavelength?

a. 0.8 m b. 12 m c. 8 m d. 80 m

35.Sound travels faster in water than…

|a. |steel. |

|b. |air. |

|c. |aluminum |

d. space

36.Which observer would hear the louder sound?

a. The lady b. The man c. They both do

37.A singer shattering crystal glass with her voice is a demonstration of…

|a. |resonance. |

|b. |sound refraction. |

|c. |an echo. |

|d. |interference. |

pared to its speed in air, the speed of light in water is…

a. slower. b. the same. c. faster.

39.Refraction is caused by…

a. waves encountering a gap. b. more than one reflection.

c. displaced images. d. changing waves speeds at a boundary.

40.Refraction…

a. can occur when a wave changes speed. b. cannot occur at a boundary

c. only occurs with mechanical waves d. only occurs with light waves

41.A penny lies in the bottom of a tea cup filled with water. As you look down on the penny, compared to its actual depth, it looks…

|a. |closer. |

|b. |farther away. |

|c. |at the same depth. |

42.The image produced by a plane mirror is…

a. real b. virtual c. magnified d. inverted

|Waves—Review Sheet: Write the vocabulary word in the blank to the right |

|a disturbance that transfers energy from place to place | |

|the maximum distance that the particles of a medium move from the rest position | |

|the bending of waves around the edge of a barrier | |

|the bending of waves due to a change in speed | |

|the highest parts of a transverse wave | |

|waves that move the particles of the medium parallel to the direction in which the waves are traveling | |

|the distance between two corresponding parts of a wave | |

|a wave that moves through a medium | |

|the interaction between two waves | |

|waves combine to make a wave with larger amplitude | |

|when an incoming wave combines with a reflected wave in such a way that the combined wave appears to be | |

|standing still. | |

|what occurs when vibrations traveling through an object match the object’s natural frequency. | |

|The highest and lowest parts of a wave | |

|the units used for measuring frequency | |

| | |

|when a wave hits a surface through which it CANNOT pass and bounces back, it is called_______ | |

|Why does refraction occur? | |

|When a wave moves through an opening in a barrier. | |

|What causes a wave? | |

|Explain what you learned about the angle of reflection from doing the tennis ball lab. | |

1. Rhonda sends a pulse along a rope. How does the position of a point on the rope, before the pulse comes, compare to the position after the pulse has passed?

4. A transverse wave is transporting energy from east to west. The particles of the medium will move

|a. east to west only |b. both eastward and westward |c. north to south only |d. both northward and southward |

5. A wave is transporting energy from left to right. The particles of the medium are moving back and forth in a leftward and rightward direction. This type of wave is known as a

|a. mechanical |b. electromagnetic |c. transverse |d. longitudinal |

7. A sound wave is a mechanical wave; not an electromagnetic wave. This means that

a. particles of the medium move perpendicular to the direction of energy transport.

b. a sound wave transports its energy through a vacuum.

c. particles of the medium regularly and repeatedly oscillate about their rest position.

d. a medium is required in order for sound waves to transport energy.

8. A science fiction film depicts inhabitants of one spaceship (in outer space) hearing the sound of a nearby spaceship as it zooms past at high speeds. Critique the physics of this film.

9. The sonar device on a fishing boat uses underwater sound to locate fish. Would you expect sonar to be a longitudinal or a transverse wave?

Consider the diagram below in order to answer questions #10-11.

[pic]

10. The wavelength of the wave in the diagram above is given by letter ______.

 

11 The amplitude of the wave in the diagram above is given by letter _____.

 

12. Indicate the interval which represents one full wavelength. Write the pairs of letters below

[pic]

22. The period of a 20 Hertz sound wave is ___________.

23. As the frequency of a wave increases, the period of the wave ___________.

|a. decreases |b. increases |c. remains the same |

24. A transverse wave is found to have a distance of 8 cm from a trough to a crest, a frequency of 12 Hz, and a distance of 6 cm from a crest to the nearest trough. Determine the amplitude, period, and wavelength of such a wave. 24. An ocean wave has an amplitude of 2.5 m. Weather conditions suddenly change such that the wave has an amplitude of 5.0 m. The amount of energy transported by the wave is __________.

a. halved c. doubled

b. quadrupled d. remains the same

25. Two waves are traveling through a container of nitrogen gas. Wave A has an amplitude of .1 cm. Wave B has an amplitude of .2 cm. The energy transported by wave B must be __________ the energy transported by wave A.

a. one-fourth

b. one-half

c. two times larger than

d. four times larger than

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