Name______
Date______
Physics
Waves and Sound Test
Date
Friday, February 19th
Study Material
Physics Book – Chapter 25 & 26
Notes taken in class
Handouts
Labs
Quizzes
Content
Vibrations and Waves
Sound
Graphing
Formulas
Vocabulary
Unit Goals
Recommendations
1) Review Quizzes – Together in Class
2) Study Notes
Format
1)35 Multiple Choice Questions
2)10 Short Answer/Problem Solving
1. Explain the Doppler Effect, what causes it, and how the sound changes due to the effect.
2. Draw and label the key components of a longitudinal wave.
3. Draw and label the key components of a traverse wave.
4. Describe the scientific process with waves that cause an earthquake.
5. Name the two body waves. Explain what waves cause damage during an earthquake.
6. What is the difference between period and frequency?
7. Give an example of natural frequency and resonance and how they are related.
8. What is the period and frequency of basketball shots taken if 78 shots are taken in 16 minutes?
9. If a wave has a frequency of 5,909 Hz and a wavelength of .046 m, what is the wave speed?
10. If a sound wave is 815 Hz, what is its wavelength?
11. How does increasing amplitude change what we hear?
12. How does increasing frequency change what we hear?
13. Describe and explain the difference between constructive and destructive interference in waves.
14. Draw an example of two transverse waves in destructive interference.
15. Draw an example of two compressional waves in constructive interference.
16. Define a wave.
17. List material types (gas, solid, liquid, and a vacuum) in order of how fast sound travels through them (fastest to slowest)
18. What are beats and how do they work?
1. Explain the Doppler Effect, what causes it, and how the sound changes due to the effect.
As an object is making sound, it is moving (or the hearer is moving). If the movement is in the direction of the sound travelling, the distance between sound waves is less and the pitch is higher. If the movement is in the opposite direction of the sound travelling, the distance between waves is greater and the pitch is lower.
2. Draw and label the key components of a longitudinal wave.
CompressionRarefaction
3. Draw and label the key components of a traverse wave.
4. Describe the scientific process with waves that cause an earthquake.
Plates in the earth’s crust either slide, buckle, or bend and break. The location of this change is the focus of the earthquake. When the earthquake happens, it sends P and S waves throughout the earth (body waves) and surface waves (Raleigh and love waves) that cause damage.
5. Name the two body waves. Explain what waves cause damage during an earthquake.
P & S waves are two body waves. P can to through everything and S can’t go through liquids. Surface waves cause the damage in an earthquake.
6. What is the difference between period and frequency?
Period is the length of time for one wave to pass, frequency is the number of waves that pass in one minute. They are inverse of each other (f=1/period)
7. Give an example of natural frequency and resonance and how they are related.
The frequency at which an object naturally resonates – the wine classes in myth busters rang at a specific frequency when hit – that is its natural frequency. The singer made a wave of the same frequency, and the wine glass resonated with the sound of the singer.
8. What is the period and frequency of basketball shots taken if 78 shots are taken in 16 minutes?
# = 78Frequency = #/t
Time = 16 minF=78 shots/16 minutes
F=4.875 shots/minute
9. If a wave has a frequency of 5,909 Hz and a wavelength of .046 m, what is the wave speed?
F=5,909 hzv=λf
λ=.046 mv=(5,909 hz)(.046 m)
v=271.8 m/s
10. If a sound wave is 815 Hz, what is its wavelength?
F=815 hzv=λf
V=340 m/s340 m/s = λ(815 hz)
λ = .42 m
11. How does increasing amplitude change what we hear?
It makes the sound louder, and only louder
12. How does increasing frequency change what we hear?
It makes the sound a higher pitch, and only higher pitch
13. Describe and explain the difference between constructive and destructive interference in waves.
Constructive interference has waves lined up and makes a larger wave as the result.
Destructive interference has waves lined up opposite (crest lined up with trough) and results in a smaller or no wave.
14. Draw an example of two transverse waves in destructive interference.
15. Draw an example of two compressional waves in constructive interference.
16. Define a wave.
A wiggle in space and time. Vibrations that travel
17. List material types (gas, solid, liquid, and a vacuum) in order of how fast sound travels through them (fastest to slowest)
Solid is fastest, then liquids, then gases.
Warmer are faster, colder are slower.
18. What are beats and how do they work?
Beats are where two waves of different frequency have crests/compressions happen at the same time making a loud sound (beat).
The difference in the frequency tells how often the beats happen per second.