Name: ------
Date: ------Grade 8----
Worksheet for Quarter 3
Question 1: choose the correct answer:
1. Sound waves from a radio generally travel in which medium?
a. air
b. earth
c. light
d. solid
2. If a transverse wave is moving from right to left, the individual particles in the medium are moving
a. right to left.
b. left to right.
c. up and down.
d. None of the above
3. Waves are often caused by
a. potential energy.
b. mechanical energy.
c. colliding objects.
d. vibrating objects.
4. The highest point of a wave is the ______, and the______is the lowest point.
a. crest, trough
b. trough, crest
c. frequency, amplitude
d. amplitude, frequency
5. Waves travel quickly in a______because the molecules are closely packed and physically bonded together.
a. liquid
b. gas
c. solid
d. Both (a) and (b)
6. The Doppler effect is an observed change in a wave’s
a. wavelength.
b. period.
c. amplitude.
d. frequency.
7. The speed of a sound wave depends on
a. depends on wavelength.
b. depends on the medium.
c. depends on amplitude.
d. None of the above
8. The ______is the distance between two crests of a wave.
a. amplitude
b. wavelength
c. frequency
d. period
9. Water waves
a. transport energy and water. c. transport water but not energy.
b. transport energy but not water. d. are not mechanical waves.
10. Sound waves are
a. transverse waves. c. circular waves.
b. longitudinal waves. d. polarized waves.
11. The frequency of a sound wave determines
a. the pitch of the sound. c. how fast the sound travels.
b. how loud the sound is. d. the magnitude of the compression.
12. Sound waves
a. require a medium. c. are not mechanical waves.
b. are unrelated to vibrations. d. can travel in a vacuum.
13. How loud a sound is depends on
a. the wavelength of the sound. c. the amplitude of the waves.
b. the pitch of the sound. d. the medium.
14. Carrie is swimming in the ocean. As she floats over a large wave, her mother calls to her from the beach. What does the ocean wave have in common with the sound waves produced by Carrie’s mother?
A. / Both kinds of waves progress through a medium.B. / Both kinds of waves displace particles permanently.
C. / Neither kind of wave was caused by vibrations.
D. / Neither kind of wave transfers energy between particles.
15. Which of these is a mechanical wave?
A. / lightB. / sound
C. / gamma ray
D. / electromagnetic
16. The diagram below shows a sound wave moving through air. What about the diagram shows that the sound wave is a mechanical wave?
A. / The sound wave causes vibration in air.B. / The sound wave was made by a machine.
C. / The sound wave causes extra air particles to form.
D. / The sound wave vibrates perpendicular to the direction of the wave motion.
17. What is one way that electromagnetic waves differ from mechanical waves?
A. / Electromagnetic waves move slower.B. / Electromagnetic waves are longitudinal.
C. / Electromagnetic waves can travel through empty space.
D. / There is no difference between electromagnetic and mechanical waves.
18. Which is the best description of a wave?
A. / energy that makes particles moveB. / a disturbance that transfers energy
C. / a disruption causing the transfer of matter
D. / any type of matter that vibrates back and forth
19. A whale makes a noise underwater that is too low-pitched for humans to hear. What type of wave is this?
A. / S waveB. / visible light
C. / mechanical
D. / electromagnetic
20. A student makes a transverse wave by shaking a rope tied to a doorknob up and down. Which statement accurately describes the wave in the rope?
A. / Each part of the rope moves in the same direction as the wave.B. / Each part of the rope moves up and down as the wave moves toward the door.
C. / Each part of the rope moves up and down as the wave moves around in circles.
D. / Each part of the rope moves up and down as the entire wave moves up and down.
21. All mechanical waves have which of the following in common?
A. / Mechanical waves are transverse.B. / Mechanical waves are longitudinal.
C. / Mechanical waves do not require a medium to move.
D. / Mechanical waves must progress through a medium.
22. A loud motorcycle passes by the front of Bill’s house. What medium does the sound wave travel through to get from the motorcycle to Bill’s ears?
A. / airB. / energy
C. / a vacuum
D. / large vibrations
23. A driver of a car honks the car horn at a dog in the street. The horn produces longitudinal waves. The dog hears the horn and runs out of the street before the car gets close. Which statement correctly describes why the dog was able to hear the car horn?
A. / Longitudinal waves travel in random directions.B. / Longitudinal waves travel around in a circular motion.
C. / Longitudinal waves travel parallel to the direction of the disturbance.
D. / Longitudinal waves travel perpendicular to the direction of the disturbance.
24. Which of these statements describes a characteristic of all mechanical waves?
A. / They travel through media.B. / They are transverse waves.
C. / They are longitudinal waves.
D. / They travel through empty space.
25. Alex hears a loud rumble as he watches a space shuttle lift off from the launch pad. What medium does the sound wave travel through to get from the shuttle to Alex’s ears?
A. / airB. / energy
C. / a vacuum
D. / large vibrations
26. Visible, infrared, and ultraviolet light are electromagnetic waves that travel from the sun to Earth. There are other types of electromagnetic waves as well.
Which statement best explains what electromagnetic waves are?
A. / waves that vibrate through a mediumB. / disturbances in the atmosphere of space
C. / disturbances in electric and magnetic fields
D. / slow-moving waves
27. Which of the following definitions of medium do you think is most likely to be used in the context of studying waves?
A. Of intermediate size
B. The matter in which a physical phenomenon takes place
C. Between two extremes.
What i28. What is the name of the lowest point of a wave?
A. / crest
B. / trough
C. / amplitude
D. / rest position
2.
29. Through which of these media do sound waves travel most slowly?
A. / iron
B. / wood
C. / water
D. / cold air
3. 30. The speed of a mechanical wave through a medium depends on the type of medium. It also depends on the type of mechanical wave. Which statement is true?
A. / All waves travel at the same speed through any medium.
B. / All waves travel at the same speed if no medium is present.
C. / Electromagnetic waves require a medium, but mechanical waves do not.
D. / Mechanical waves require a medium, but electromagnetic waves do not.
4. 31. During a thunderstorm, Sanjay saw lightning and then heard thunder 5 seconds later. What would be different if the air had been warmer?
A. / He would have seen the lightning and heard the thunder at the same time.
B. / He would have heard the thunder before seeing the lightning.
C. / He would have heard the thunder sooner.
D. / He would have heard the thunder later.
5. 32.Which term describes the length between two adjacent crests of a wave?
A. / period
B. / frequency
C. / amplitude
D. / wavelength
6. 33. Mei knows the wavelength and the frequency of a wave. How will she use this information to calculate the speed of the wave?
A. / Add frequency and wavelength.
B. / Divide frequency by wavelength.
C. / Divide wavelength by frequency.
D. / Multiply wavelength and frequency.
7. 34.The medium through which a mechanical wave passes can be a solid, a liquid, or a gas. Properties of a wave might change when it moves from one medium to another. What happens to the speed of a wave when it moves from a gas to a solid?
A. / It speeds up.
B. / It slows down.
C. / It remains the same.
D. / It speeds up and then slows down.
8. 35.Sashita uses the volume control on her TV to make the sound louder or softer. Which property of waves is Sashita’s volume control changing?
A. / amplitude
B. / wave period
C. / wavelength
D. / wave speed
9.
36.T 36. The diagram shows the shape and different measurements of a wave. What property of the wave does F measure?
A. / period
B. / frequency
C. / amplitude
D. / wavelength
10.
37. Frequency equals the number of wavelengths per unit of time.
Which unit is used to measure frequency as cycles per second?
Wavelengths
Frequency = ––––––––––––––––––––––––––––––––––
Unit of time
A. / hertz
B. / period
C. / crest
D. / minutes
11. 38.Which statement about the effects of medium on the speed of a mechanical wave is true?
A. / Medium has no effect on the speed of a mechanical wave.
B. / A mechanical wave generally travels faster in solids than liquids.
C. / A mechanical wave generally travels faster in gases than liquids.
D. / A mechanical wave always travels through liquids at the speed of light.
Make a list of electromagnetic waves, and state 2 of their properties.
------
Label each true statement with a T, and each false statement with an F. If a statement is false, replace the underlined term to make the statement true. Write your response in the space provided.
1. Radio waves are an example of mechanical waves. ______
2. Sound waves are examples of longitudinal waves. ______
3. As the frequency of sound waves increases, the wavelength of the sound waves decreases. ______
4. The highest point of a wave is called the ______.
5. Ocean waves carry water from hundreds of miles away. ------.
6. Sound waves can travel across outer space. ------.
Read each statement and write in the blank the word or words that best completes the statement.
1. The matter through which a wave travels is called the ______.
2. A wave that causes the particles of the medium to vibrate perpendicularly to the direction the wave travels is called a(n) ______.
3. The lowest point of a wave is called the ______.
4. A(n) ______is defined as a wave that requires a medium.
5. The distance over which a waves shape repeats. ------.
6. The maximum distance that particles in a waves medium vibrate from their rest position. ------.
7. The time required for one wavelength to pass a point is the ------.
8. The number of wavelengths that pass a point in a given amount of time is ------.
9. The speed at which a wave travels through a medium is ------.
10. A wave that causes the particles of the medium to vibrate parallel to the direction the wave travels is called a(n) ______.
11. The air around you is full of space. ------.
12. Light travels as a(n) ______wave.
13. Sound is a(n) ______wave because it cannot travel without a medium.
Name the medium for each of the following types of waves:
1. Ocean waves: ------
2. Earthquake waves: ------
3. Sound waves from a speaker: ------
.
SHORT ANSWER
1 Andrew and his partner are divers. They are working underwater, 10 m apart, on an oil platform. Josh and his partner are working, also 10 m apart, on the part of the platform that is above water. Andrew and Josh each make a loud noise of the same volume at the same time. Whose partner hears the noise first? Explain your answer.
______
2. Some waves carry more energy than others. Which wave has more energy, a loud sound or a quiet sound? Why?
______
3. The distance from the crest of one wave to the crest of the next wave is the ______.
4. ______, the number of waves produced in a given amount of time, is expressed in Hertz.
5. The maximum distance that the particles of a medium move away from their rest position is a measure of a wave’s ______.
TRUE/FALSE
A Sound wave is a longitudinal wave that is caused by vibrations in a medium.
1. Decibels are units that measure the pitch of a sound.
2. Sound waves reach our ears as waves.
3. Loud sounds are not harmful to humans.
4. All animals hear the same range of frequencies.
5. Sound can travel in outer space.
6. Sound can travel in water.
7. Loudness is expressed in decibels.
8. Hertz is how you think sound is high or low.
9. Human can hear sounds at any frequencies.
10. An echo is a reflected sound wave.
11. Some animals use sound waves to find food.
12. Sound waves are sent from one telephone to another.
13. Computers can save and store sound waves.
14. The greater the frequency of a sound wave, the louder the sound.
15. An echo is a sound wave that is absorbed by a soft material.
16. Interference occurs when two or more waves overlap and combine to form one wave.
17. Ultrasound technology is used to create medical images and it is based on sound waves with frequencies so high that human ears cannot hear them.
MULTIPLE CHOICE
1. Sound waves are examples of
a. longitudinal waves.
b. transverse waves
c. mechanical waves.
d. circular waves
2. To hear, which of the following takes place?