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# unit 9 study guide

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Unit 9, Chapter 17 Study Guide

Part I- Completion- Use the word choices below to fill in the blanks. Words may be used
once, more than once or not at all.

amplitude             disturb                energy                 longitudinal
medium                period                 surface                transverse

1. All mechanical waves are created by a source of ________________________.
2. Mechanical waves will move through a __________ but will not move it from
place to place. (***Needed rewritten from original)
3. The solid, liquid or gas that a mechanical wave moves through is called a(n)
__________________.
4. Ripples moving across the top of water are examples of ________________
waves.
5. Mechanical waves transfer ________________ through different materials.
6. A mechanical wave that causes the medium to vibrate at right angles to the
wave’s motion is a __________________ wave.
7. The amount of energy carried by a mechanical wave is related to the
______________.
8. A mechanical wave that causes the medium to vibrate parallel to the wave’s
motion is a _________________ wave.
9. A mechanical wave that causes the medium to move in a circle is a ___________
wave.
10. A mechanical wave that travels as a series of crests and troughs is a __________
wave.
11. A mechanical wave that travels as a series of compressions and rarefactions is a
_______________ wave.
12. The length of time it takes for a complete wavelength to pass a fixed point is
called a ______________.
13. The maximum distance from the crest to the rest position or the trough to the rest
position is the ________________.
Part II: Matching- Write the letter of the word next to the best description of that word.
Each choice will be used once.

A. constructive interference    B. destructive interference          C. diffraction
D. reflection                   E. refraction

_____ 1. Property of a wave that prevents the wave from moving forward.
_____ 2. This will occur more if the wavelength is large compared to the opening or
obstacle.
_____ 3. When two or more waves combine to produce a wave with a larger amplitude.
_____ 4. When two or more waves combine to produce a wave with a smaller amplitude.
_____ 5. This will occur if a wave enters a new medium at an angle.

Part III: Open Ended- Answer the following questions on a separate sheet of paper.

1. A sound wave is an example of what type of mechanical wave?

2. In what type of medium does sound travel the slowest? fastest?

3. What type of equipment measures the time delay of returning echoes in water?

4. Explain the Doppler effect and how this effects the sounds that you hear as
vehicles move towards you and away from you.

5. What do pianos and violins use to amplify their sound?

6. What are the three regions of the ear? What is the function of each region?

7. How do frequencies that people hear compare with frequencies of ultrasound?

8. When a woman sings, every time she sings a particular note a window rattles.
How can this be explained in terms of wave behaviors?

9. A wave has a wavelength of 12.0 cm and a frequency of 4.0 hertz. What is its
speed?

10. A wave has a speed of 100 m/s and a frequency of 25 Hertz. What is its
wavelength?

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