Ch 26 Day 1 – Sound

May 15 & 16

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:1. Read & Study 26.1 – 26.4, 26.6 – 26.7 2. Do # 1-12 – 7 points, ½ pt each & 1 pt for

correctness 3. Finish POGIL if needed.

**Test May 21 & 22 on CH 25 & 26**

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

EXIT: Get a Clicker and Take an Exit SlipHINT – you may need to reference #17 in your Ch 26 POGIL

1. 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.

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?

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?

1. 2. 3. 4. 5. 6.

63%

13% 13%

0%

13%

0%

1. Less than 170 m2. 170-171 m3. Between 171 - 340 m4. 340-342 m5. More than 342 m6. Not enough info to solve.

1. 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)

Regarding #1, how do you feel?

1. 2. 3. 4.

8% 8%

25%

58%

1. I have no clue what is going on

2. I think I’ll be ok with more practice

3. I did not get this correct the first time, but I know how to fix my error in the future

4. I got this correct the first time and I know what I am doing sow ell I could teach it to others!

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?

1. 2. 3. 4. 5. 6.

44%

11%

0%

33%

11%

0%

1. Approx. 10.2 m2. Approx. 33.3 m3. Approx. 342 m4. Approx. 11,322 m5. Correct answer is not

listed6. Not enough info to solve.

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?

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)

1. 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?

340= 33.3

= 10.2 m

#2 – can a human hear this sound?

1. 2. 3.

9%0%

91%

1. Yes2. No 3. Not enough info to solve

33.3 Hz = withinHuman hearingRange

#2 – can a dog hear this sound?

1. 2. 3.

36%

0%

64%

1. Yes2. No 3. Not sure

33.3 Hz = NOT withindog hearingRange

Regarding #2, how do you feel?

1. 2. 3. 4.

17%

0%

25%

58%

1. I have no clue what is going on

2. I think I’ll be ok with more practice

3. I did not get this correct the first time, but I know how to fix my error in the future

4. I got this correct the first time and I know what I am doing sow ell I could teach it to others!