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Ch 26 Day 1 – Sound

Ch 26 Day 1 – Sound . May 15 & 16 . Do Now: Take back your… - CH 10-11 Test - Ch 25 Quiz Make corrections on both! FINALS are soon, and these are your study guide! When done, see me for today’s POGIL – you are working at your own pace today to the bell. Homework:

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Ch 26 Day 1 – Sound

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  1. Ch 26 Day 1 – Sound May 15 & 16

  2. Do Now:Take back your… - CH 10-11 Test - Ch 25 QuizMake corrections on both! FINALS are soon, and these are your study guide! When done, see me for today’s POGIL – you are working at your own pace today to the bell. Homework: • Read & Study 26.1 – 26.4, 26.6 – 26.7 • Do # 1-12 – 7 points, ½ pt each & 1 pt for correctness • Finish POGIL if needed. **Test May 21 & 22 on CH 25 & 26**

  3. Finish the POGIL!!! • Whatever is not done becomes HW!!! • In addition to this HW: Read & Study 26.1 – 26.4, 26.6 – 26.7 Do # 1-12 – 7 points, ½ pt each & 1 pt for correctness

  4. EXIT: Get a Clicker and Take an Exit SlipHINT – you may need to reference #17 in your Ch 26 POGIL • A bat flying in a room temperature cave emits a sound pulse and receives its echo in 1 second. How far away is the cave wall? 2. A sound travels in room temperature air. It takes 0.03 seconds for one sound wave to occur. • What is the wavelength of the sound wave? • Can a human hear this sound wave? • Can a dog hear this sound wave?

  5. A bat flying in a room temperature cave emits a sound pulse and receives its echo in 1 second. How far away is the cave wall? • Less than 170 m • 170-171 m • Between 171 - 340 m • 340-342 m • More than 342 m • Not enough info to solve.

  6. A bat flying in a room temperature cave emits a sound pulse and receives its echo in 1 second. How far away is the cave wall? • What do we know? • Room temperature air = sound wavespeed of 342 m/s (or 340 if you rounded) • Wavespeed = distance traveled / time • 342 m/s = x/ 1s • 342 m/s = 342m / 1s • Which means that since it was an ECHO, the cave wall is 171 m away! • (travels 171 m there, and 171 m back, for a total distance of 342 m)

  7. Regarding #1, how do you feel? • I have no clue what is going on • I think I’ll be ok with more practice • I did not get this correct the first time, but I know how to fix my error in the future • I got this correct the first time and I know what I am doing sow ell I could teach it to others!

  8. 2. A sound travels in room temperature air. It takes 0.03 seconds for one sound wave to occur. A. What is the wavelength of the sound wave? B. Can a human hear this sound wave?C. Can a dog hear this sound wave? • Approx. 10.2 m • Approx. 33.3 m • Approx. 342 m • Approx. 11,322 m • Correct answer is not listed • Not enough info to solve.

  9. 2. A sound travels in room temperature air. It takes 0.03 seconds for one sound wave to occur. • What is the wavelength of the sound wave? • Can a human hear this sound wave? • Can a dog hear this sound wave? What do we know? • Room temperature air = sound wavespeed of 340 or 342 m/s • 0.03 seconds for one sound wave is the period • Frequency = 1/ period • f = 1/ (0.03)  f = 33.3 Hz (in other words, there are 33 waves per second)

  10. A sound travels in room temperature air. It takes 0.03 seconds for one sound wave to occur. • What is the wavelength of the sound wave? • Can a human hear this sound wave? • Can a dog hear this sound wave? • = 33.3 = 10.2 m

  11. #2 – can a human hear this sound? • Yes • No • Not enough info to solve 33.3 Hz = within Human hearing Range

  12. #2 – can a dog hear this sound? • Yes • No • Not sure 33.3 Hz = NOT within dog hearing Range

  13. Regarding #2, how do you feel? • I have no clue what is going on • I think I’ll be ok with more practice • I did not get this correct the first time, but I know how to fix my error in the future • I got this correct the first time and I know what I am doing sow ell I could teach it to others!

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