8.3 Sound and Light Pre Test 21-22 SY - Courtney Rose | Library

You may use your own incredible brain power on this pre-unit assessment. NO Googling - you need to show what YOU know, not what you can find on a search engine. Try your best!

A team of students is visiting a theme park, where they get to go behind-the-scenes and learn some of the secrets behind their favorite games and effects!

Shooting Gallery

At the Shooting Gallery, players use a laser gun to shoot mechanical fish in a pool of water.

Required

1

Which of the following light path models correctly shows the path the light travels from the laser gun to the fish? Choose the best answer below.

Required

3

Describe the path of the laser light ray as it travels from the laser gun through the air to the water to the fish, to support your answer in question 1. Be sure to include science reasoning in your answer.

Wave Pool

At the Wave Pool, a wave-making machine creates big water waves for swimmers. Students study the Wave Machine: a large, motor-driven paddle that moves back and forth (see figure to the right). Every time the paddle moves forward it pushes water and makes a wave. The students watched the waves pass by them in the Wave Pool.

The students noticed that the waves produced by the Wave Machine have properties that are the same for ALL waves. The Wave Model (see figure) uses a sine wave to represent a side view of the water surface. The undisturbed water surface level is labeled “Rest Position”.

Complete the Wave Model by choosing the correct terms for the areas labeled A and B.

Required

1

What is the correct label for A?

Required

1

What is the correct label for B?

The Wave Machine operator demonstrated that she could change the number of waves produced by changing how fast the Wave Machine paddle moves back and forth.
The students started counting how many waves pass by in a minute, and noticed that this number changed from Time 1 to Time 2 (diagram on right) as the Wave Machine paddle increased its speed.

Required

3

Complete the following sentences to describe changes in the waves between Time 1 and Time 2. For each sentence, choose one of the word choices below and drag it into place.
The ______________   of the waves increased from Time 1 to Time 2.
The _______________   of the waves decreased from Time 1 to Time 2.
The ______________   of the waves did not change from Time 1 to Time 2. 

Other Answer Choices:

Frequency

Wavelength

Amplitude

The Wave Machine operator returned the Wave Machine to the original settings. Then she adjusted the controls to show the students another way that she can change the waves, by changing the amount of force the paddle uses to push on the water.
The students started watching the waves, and noticed the waves changed from Time 3 to Time 4 (diagram on right) as the operator adjusted the Wave Machine controls to make the paddle increase the force of its pushes on the water.

Required

3

Complete the following sentences to describe changes in the waves between Time 3 and Time 4. For each sentence, choose one of the word choices below and drag it into place.
The amplitude of the waves ______________   from Time 3 to Time 4.
The frequency of the waves ___________________   from Time 3 to Time 4.
The wavelength of the waves ___________________   from Time 3 to Time 4.

Other Answer Choices:

did not change

increased

decreased

The operator then set up the Wave Machine to make waves continuously.
The students watched swimmers in different parts of the pool, wondered about where the swimmers should be located to experience the highest energy waves, or if it mattered at all where they were in the pool.

Required

1

In which area of the pool would a swimmer experience the highest energy waves? Choose one answer below.

Required

3

Describe why you chose your answer above for question 7. Use your knowledge of waves and wave energy and refer to the labeled wave pool diagram.

Light Show

Students go behind the scenes at the Light Show auditorium. The light show operator tells them, “I can use the Light Show Control Panel to create awesome lighting effects.”

The “Rainbow” control sends a narrow beam of white light through a clear glass prism, as shown in the model below. The output is a continuous band of colors, like a rainbow.

Required

3

Use the model to help describe how the light output from the prism is different than the white light input. Make sure you include the concepts of color and wavelength in your answer.

The Filter Color Control selects a colored filter and places it in front of incoming white light, which is composed of six different wavelengths. A green light filter is placed between the white light input and the person on the other side of the filter.
An incomplete model is shown at right. 

Required

1

Choose the color(s) of every wavelength of light that will travel through the green light filter and be seen by the person on the other side of the filter.

Required

1

Describe how the green filter works. Be sure to include wavelength and color in your answer.

Hop Til You Drop Dance Stage

At the Hop Til You Drop Dance Stage, flashing lights are timed with the dance music. Players are challenged to keep up with the rhythm of the music by using the light flashes as cues.

Required

3

Start with how the ears/eyes receive receptors and finish with the brain sending receptors to your body to dance. Drag the labels to put the steps in order.

___________  Body parts move as a dancing behavior, timed with the music and light flashes.
___________  The brain sends signals to body parts.
____________  Sense Receptors in the eyes receive light energy input and sense receptors in the ears receive sound energy input. 
___________  Signals travelling along nerve cells enter the brain.
___________  Brain Signals direct which body parts need to move.
___________  Signals travel from receptors in the eyes and ears along nerve cells to the brain.

Other Answer Choices:

Step 6

Step 3

Step 1

Step 4

Step 2

Step 5

When the students were on the Dance Stage, they were easily able to follow all of the dance moves.
Later, when the students were about a mile away from the Dance Stage, they could still see the lights flash and hear the music, but the music was no longer timed with the light flashes, which made it difficult to dance in time with the lights and music!

Required

1

Which of the following describes why the sound was no longer timed with the light flashes when the students were a mile away from the light and sound source?

Fun House

In the Fun House, there are all kinds of booths that feature tricks with lights. One of the favorites is “Light Detective”: trying to guess the color of a ball by shining different colored lights on it. The ball sits within a display case with a light control dial, that only allows one color of light to shine on the ball at a time. The table below shows the experimental results of shining different colored lights on the ball to determine its actual color.

Required

3

Complete the sentence starters below to describe how light interacts with the ball:
A. The color that the ball appears to us depends on ___________________________________________________________________________________________________________  
B. When a single color light shines on the ball, __________________________________________________________________________________________________________________  
C. When white light shines on the ball, ____________________________________________________________________________________________________________________  

Other Answer Choices:

the light wavelengths that it reflects towards our eyes; if it absorbs colors, the ball appears gray.

only the colors that the ball is made of will reflect; all the other colors will be absorbed and appear gray.

white light is composed of all colors so the actual colors of the ball could be seen (red with green stripes).

Sound Engineer

Required

3

The students visit the theme park’s sound engineer who is in charge of all the background music for the park.

The engineer shows the students the big speakers located in the middle of the park and explains that the big speakers are used to transmit sound through the air so people can hear the music in all the outdoor areas of the park.

How does the sound travel from the speakers to other areas of the theme park? Check all that apply.

Required

1

The sound engineer explained that she changes the way that the music sounds for different areas of the park so that people outside or in big crowds can still hear, but people inside buildings don’t get blasted by sound energy!

The engineer told them, “I have two controls that I use to change the sound: Loudness and Pitch.”

Which sound wave property does the Loudness control change? Choose one answer below.

Required

1

Which sound wave property does the Pitch control change? Choose one answer below. (Refer to the image of the Sound Control Panel from the previous question.)

Required

1

True or false? When the operator turns the Loudness control to increase the loudness, the sound wave changes. The increase of amplitude in the wave causes the wave to have less energy, making the waves smaller.

Required

1

True or false? When the operator turns the Pitch control to decrease the pitch, the sound wave changes. The sound wave has less energy, so less energy is transferred to people’s ears.

Magic Mirror Maze

Required

3

In the Magic Mirror Maze, as shown below, the hallways are designed to trick players as they attempt to find their way through. Different wall materials are used to trick players, so the walls can be dark, see-through, or act as mirrors.
Review the set of data on the properties of different wall materials with respect to incoming light. Use this data to answer the drag and drop questions below.
A. Which material should be used to make a wall appear darkest? _______________  
B. Which material should be used to make a wall appear most like a clear window? _______________     
C. Which material should be used to make a wall appear most like a mirror? _______________  

Other Answer Choices:

Material D

Material B

Material A

Material C

Required

1

When light shines on an object, which of the following statements best summarizes the interaction of light waves with the object? Choose one answer below.

Required

1

Your team of students wants to go to one last theme park ride, but a thunderstorm happens! What part of the storm are you going to experience FIRST?

Required

3

Explain how sound and light waves travel through the air during a thunderstorm. In your answer, be sure to explain which type of wave you see first and why.