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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 del 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.