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Cause and effect relationship between wave speed frequency wavelength
1. Good Morning!
• Today, we will:
– talk about cause and effect relationships
– write cause and effect relationships for wave
speed, wavelength, and frequency
• Please DO BEFORE THE BELL:
– get your lab notebook
– get out something to write with
2. Cause and Effect
Why did it happen? What happened?
The soccer ball
Jaime kicked rolled across
the soccer ball. the field.
Cause Effect
3. Cause and Effect
• Sometimes it’s easier to start with the effect
because that’s what you see/hear/experience
Why did it happen? What happened?
Vincent stayed up
Vincent fell
all night playing
video games. asleep in class.
Cause Effect
4. Cause and Effect
When wave speed was held constant…
The wavelength of The frequency
the vibrating string of the sound
was shortened. increased.
Cause Effect
5. Cause and Effect
When wavelength was held constant…
The frequency
The speed of the
of the sound
wave decreased.
decreased.
6. Cause and Effect Relationships
• Using academic language, describe the cause
and effect relationship between:
1. frequency and wave speed when
wavelength is constant
2. frequency and wavelength when wave
speed is constant
7. Mathematical Relationships
• The formula that relates wave
speed, wavelength and frequency is:
• V= f x λ
• In the next few slides, we’ll look at some
mathematical relationships between these
variables.
8. V=f x λ
• If wavelength is held constant and frequency
is doubled, what happens to wave speed
(velocity)?
– velocity doubles
• If increasing one variable causes another
variable to increase by the same
magnitude, that relationship is called a
directly proportional relationship.
9. V=f x λ
• If wave speed is held constant and frequency
is doubled, what happens to wavelength?
– wavelength is halved
• If increasing one variable causes another
variable to decrease by the inverse of the
same magnitude, that relationship is called a
inversely proportional relationship.
10. Mathematical Relationships
• Using mathematical reasoning and
language, create a mathematical example that
describes the cause and effect relationship
between:
1. frequency and wave speed when wavelength is
constant
2. frequency and wavelength when wave speed is
constant
Notas do Editor
After you click in the first animation, the sentence will seem to read, “When wave speed was held constant, the frequency of the sound increased.” While a sentence like that is written in perfectly good academic language, it seems to infer that holding the wave speed constant caused the frequency of the sound to increase. This is a great time to point this out to students and prompt them to think about whether or not holding wave speed constant is really a “cause” or if it is simply a condition.
Notice with each progressive slide, less support in the graphic organizer s provided. This is an intentional effort to: 1) encourage students to use their notes 2) encourage students to think for themselves.
Often, students need some help with “academic” language. As I teach ELA and special education 9th graders, I often give my students some choices to use when constructing an academic language sentence. In this cause and effect assignment, I would put words up on the board such as: because, because of, as a result, caused, led to, resulted in, if…then…, due to, etc.
Younger students may be able to better grasp this concept if it is more general – replacing “doubled” with increased and calling it simply a direct relationship.
Younger students may be able to better grasp this concept if it is more general – replacing “doubled” and “halved” with “increased” and “decreased” and calling it simply an inverse relationship.
