Unit 4 Waves Test Review

Unit 4 Waves

Unit Test Review

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• Open your Knowledge Checklist

• Knew the Answer? Check it off

• Need help? Review the slides/videos!

Multiple Choice

#1 - Do waves transmit matter?

Got this wrong? Review the concept on next page ->

• Yes, all waves transmit matter

• Yes, but only mechanical waves can transmit matter

• No, waves are disturbances in matter but do not transmit matter

• No, waves do not interact with matter at all

Multiple Choice

#2 - A child is banging a pot. What is the medium of the sound waves that reach our ears?

• air

• large pot

• spoon

• glass of water

Multiple Choice

#3 - Which of the following is NOT an example of a medium?

• Rock

• Air

• Vacuum (empty space)

• Milk

#4 - Transverse or Longitudinal?

(Type me in chat)

Answer with explanation next page>

Answer: Transverse

The particles (red dots) are moving up and down (perpendicular) to the right and left direction of the energy.

#5 - Transverse or Longitudinal?

(Type me in chat)

Answer with explanation next page>

Answer: Longitudinal

The wave AND the slinky are traveling left to right. (The medium is traveling parallel to the direction of the wave energy).

Multiple Choice

#6 - A type of wave that is a combination of a transverse and a longitudinal wave is called a _________.

Answer with explanation next page-->

• Sound wave

• Surface wave

• Light wave

• Slinky wave

Surface Waves

Notice the circular motion? Surface waves (waves at the top of the ocean) go both up and down AND side to side in a circular motion.

Multiple Choice

#7 - Why are sound waves considered a type of mechanical energy?

Answer with explanation next page>

• Sounds waves are made by machines

• Sound waves can travel through space

• Sound waves can travel through a solid

• Sound waves transfer energy by the motion of particles

#8 What is the wavelength of this wave?

A. 8 cm

B. 3 cm

C. 16 cm

D. 4 cm

Explanation next page -->

#8 Answer

What is the wavelength of this wave?

Measure crest to crest

Answer: 8 cm

#9 What is the height of the crest?

A. 4 cm

B. 3 cm

C. -3 cm

D. 16 cm

#9 Answer

What is the height of the crest?

Answer: B. 3 cm

#10

What is another name for the height of the crest? (type me in chat)

Answer: Amplitude

#11

Which letter represents the trough of the wave?

A

B

C

D

E

#11 Answer

Which letter represents the trough of the wave?

Answer: D

Multiple Choice

#12 - What pattern would you noticed in the sound waves generated by a musical instruments that is played louder and louder?

• Increasing amplitude

• Increasing speed

• Increasing wavelengths

• Increasing frequency

#12 Amplitude Explanation

Animal is playing louder than Rowlf.

Notice the difference in amplitudes when you play louder vs. softer!

**Special Note: the longitudinal waves of sound have been converted to transverse waves for you to see the height of amplitude.

#13 A student is tapping a glass of water. The sound waves make waves in the glass of water.

How would the student increase the amplitude of the waves in the glass of water? (Type me in chat)

#13 Answer:

Tap harder and give the waves more energy (disturbance)!

#14 How does wave 1 differ from wave 4?

• A. Wave 1 has a lower frequency than 4

• B. Wave 1 has a higher frequency than 4

• C. Wave 1 has a higher amplitude than 4

• D. Wave 1 has a smaller wavelength than 4

#14 Answer: A

• _{A. Wave 1 has a lower frequency than 4}

• B. Wave 1 has a higher frequency than 4

• _{C. Wave 1 has a higher amplitude than 4}

• _{D. Wave 1 has a smaller wavelength than 4}

#14 Frequency Analogy

Four lady bugs were racing to the finish line. The winner was the one that went up and down the most hills. They ALL crossed at the same time.

WHICH LADY BUG WON?

#14 Frequency Analogy

Answer: The ladybug with the highest frequency won! So frequency is the waves cycle more frequently in a given time frame. Therefore the 4 wave has the highest frequency. There would be more of them in the same amount of time.

Multiple Choice

#15 When the frequency of a wave increases, what happens to the wavelength? (Think the ladybug race analogy)

• It decreases

• It increases

• It does not change

• It disappears

Electromagnetic Waves

Lesson 4.09

Multiple Choice

16.

Which event demonstrates electromagnetic waves transferring energy?

• A person diving in a swimming pool

• An explosion causing a window to break

• Sun heating a car sitting in a parking lot

• An astronaut tapping two rocks together

Multiple Choice

17.

Which statement describes how electromagnetic waves and sound waves are alike?

• Both types of waves have an electrical and magnetic field

• Both types of waves can travel in space

• Both types of waves are mechanical waves

• Both types of waves transfer energy?

Refraction

Lesson 4.10

Multiple Choice

18.

Which phenomenon is the bending of light (it also happens with sound, water and other waves) as it passes from one transparent substance into another?

• Refraction

• Diffraction

• Interference

• Speed

19.

We calculated speed of sound through four substances.

What is different?

A. their weights

B. their densities

C. their pressures

Sound Energy

Multiple Choice

20.

Mrs. Kucalaba uses a spoon to tap a glass of water three times. All three taps created sound waves. The first tap could not be heard. The second tap could be heard faintly. The third tap could be heard easily.

How did the sound waves produced by the three taps differ?

• by the type of sound waves produced

• by the speed of the sound waves produced

• by the amount of energy carried by each wave

• by the form of energy produced by each tap

Multiple Choice

21.

Why do voices sound different when you listen to them through the wall?

• Sound waves do not pass through solid materials

• Sound waves travel at different speeds when traveling through different materials

Multiple Choice

22.

What is the best explanation for the lack of sound in outer space?

• Outer space has no medium for soundwaves to travel through

• Radiant energy from the sun interferes with the transfer of sound energy

• Only certain sounds can travel in outer space