gizmos sound beats and sine waves answer key 2021 vocabulary amplitude
constructive interference
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Student Exploration: Sound Beats and Sine Waves
Directions: Follow the instructions to go through the simulation. Respond to the questions and
prompts in the orange boxes.
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. The picture at left shows water ripples interacting. What do you notice
about the area indicated by the arrow?
I noticed there are no distinct ripples in that area. It looked like the two
ripples were intersecting.
2. Why do you think there are no distinct ripples in the area indicated by the
arrow?
I think there are no distinct ripples in that area because there could be
something interfering with it
Gizmo Warm-up
Just like ripples on the surface of water, sound waves can interact
with and influence each other. You can use the Sound Beats and
Sine Waves Gizmo to explore two different types of sound wave
interactions.
If you have headphones available, put them on now. Under Visual,
turn on Sound A. Click the PLAY icon ( ) next to the Sound A
slider. Listen closely to the sound. Now, click PLAY next to the
Sound B slider.
1. How do the two sounds compare?
Sounds A and B sounded the same.
2. Click the PLAY icon under the word Auditory to play Sound A and Sound B together. How does this sound
differ from Sound A and Sound B when they are played alone?
When played together, the sound is louder and is higher than when Sound A and B were played alone.
, Activity A: Get the Gizmo ready:
● Make sure the Frequency for both Sound A and
Constructive Sound B is set to 440 Hz.
interference ● Check that the Visual for Sound A is on.
Introduction: The sine wave shown in the Gizmo represents a sound wave.
Crests, or high points, correspond to places where air molecules are pushed
together in a sound wave. Troughs, or low points, correspond to places where
air molecules are spread apart in a sound wave. The amplitude of the wave is
the distance between a crest or trough and the rest position on the horizontal
axis.
Question: How do two waves with the same frequency interact?
1. Compare: A wave’s frequency is the number of waves that pass a point in a given time. Frequency is
measured in hertz (Hz), or waves per second. Sounds A and B currently have the same frequency. How do
you think Sound B’s sine wave will compare to Sound A’s?
Since Sounds A and B have the same frequency, I think that their sound waves would be the
same.
Turn on the Visual for Sound B to check your answer.
2. Observe: Turn on the Visual for Sound A + B. What happens when these two sound waves combine?
When the two sound waves were combined, the frequency stayed the same but the amplitude
increased by about 1.
3. Make a rule: In the Warm-up, you discovered that when Sound A and Sound B are played together, the
volume of the combined sound increases. Make a rule that explains the relationship between a sound
wave’s amplitude and its volume:
A wave with a larger amplitude will have a louder volume
A wave with a smaller amplitude will have a quieter volume
4. Draw conclusions: Turn on the Time marker. Position the marker over a wave crest. The amplitude of each
wave is given on the bottom left side of the Gizmo screen.
A. What is the amplitude of Sound A? 0.9999 Sound B? 0.9999
B. What is the amplitude of Sound A + B? 1.9998
C. Complete the sentence: The amplitude of Sound A + B is equal to the sum of
Sound A and Sound B
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