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Understanding Sound Waves: Velocity, Frequency, and Wavelength Calculations

This lesson explores the characteristics of sound waves, focusing on the relationship between velocity, frequency, and wavelength. For example, a sound wave in air travels at 345 m/s with a frequency of 440 Hz, resulting in a wavelength of approximately 0.784 m. We will also discuss methods to alter sound frequency, including modifying the wavelength or tension of the medium. Additionally, we will reflect on key insights gained from the "string telephone" activity, particularly how waves transmit energy and the necessity of a medium.

abra-weber
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Understanding Sound Waves: Velocity, Frequency, and Wavelength Calculations

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  1. (Mon) A sound wave has a velocity of 345 m/s in air. If the frequency (pitch) of the sound is 440 Hz, what is the wavelength of the sound wave in air? (5 min / 6 pts)

  2. (Mon) A sound wave has a velocity of 345 m/s in air. If the frequency (pitch) of the sound is 440 Hz, what is the wavelength of the sound wave in air? (5 min / 6 pts) v = f x λ 345 m/s = (440 Hz)(λ) V 345 m/s λ = (345 m/s)/(440 1/s) ∕ λ = 0.784 m f = λ 440 Hz λ = 0.784 m

  3. (Tue) Veteran’s Day – No School

  4. (Wed) During the lab, you changed the pitch (frequency) of the sound several different ways. According to the formula v = f x λ, what are two ways to change the sound frequency and what did you do during the lab to make the change? (5 min / 8 pts)

  5. (Wed) During the lab, you changed the pitch (frequency) of the sound several different ways. According to the formula v = f x λ, what are two ways to change the sound frequency and what did you do during the lab to make the change? (5 min / 8 pts) For a constant wave velocity: Change the wavelength Shorten the string (use finger or move stick) For a constant wavelength: Change the velocity Change string tension Change string mass

  6. (Thu) During the “string telephone” activity, we learned four very important facts concerning waves and energy. What were those facts? (5 min / 8 pts)

  7. (Thu) During the “string telephone” activity, we learned four very important facts concerning waves and energy. What were those facts? (5 min / 8 pts) Waves carry energy from one place to another Even though waves carry energy through matter, there is no net movement of the matter Sound waves are longitudinal waves Sound waves need a medium to go through – no medium, no sound waves

  8. End of Week Procedures • Add up all the points you got this week • Put the total number of points at the top of your page (out of 22 points) • List any dates you were absent or tardy (and why) • Make sure your name and period # is on the top of the page • Turn in your papers

  9. (Fri) Quiz today – no warm up

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