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345 m/s = (440 Hz)( λ )

(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).

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345 m/s = (440 Hz)( λ )

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

  4. (Tue) 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

  5. (Wed) Veteran’s Day – No School

  6. (Thu) A sound wave traveling in air has a frequency of 25 Hz. What is the wavelength and period of this wave?(8 min / 8 pts)

  7. (Thu) A sound wave traveling in air has a frequency of 25 Hz. What is the wavelength and period of this wave?(8 min/8 pts) f = 25 Hz v = 345 m/s v = f x λ 345 m/s = (25 Hz)(λ) (345 m/s)/(25 Hz) = λ 13.8 m = λ T = 1/f T = 1/25 cycles/sec T = 0.04 seconds/cycle

  8. (Fri) What is the difference between the frequency and the period of a wave? If we shake a slinky up and down so that it crests 24 times in 5 seconds, what is the period and the frequency of the wave?(8 min / 8 pts)

  9. (Fri) What is the difference between the frequency and the period of a wave? If we shake a slinky up and down so that it crests 24 times in 5 seconds, what is the period and the frequency of the wave?(8 min/8 pts) Difference: Period Frequency = time span # cycles = # cycles time span f = # crests / # seconds T = # seconds / crest f = 24 crests / 5 seconds T = 5 seconds / 24 crests f = 4.8 Hz T = 0.21 seconds / cycle

  10. End of Week Procedures • Add up all the points you got this week • Put the total number of points out of 22 points you earnedat the top of your page (no total, lose 5 points) • List any dates you were absent or tardy (and why) • Make sure your name and period # is on the top of the page (no name, no credit) • Turn in your papers

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