Lab: Speed of Sound in Air

Today you are completing a lab to verify the speed of sound in air:

Lab: Speed of Sound in Air

Here are some tips/reminders that were on the board:

If you missed this lab, there is a way to do it online. This simulator is the best I could find because it explains the lab and most closely emulates the physical process involved: http://physics.bu.edu/~duffy/HTML5/speed_of_sound.html

The only problem is that it only has 3 available frequencies, and we need at least 6 for a graph, preferably 8. Go ahead and...ugh, I have trouble even typing this...go ahead and make your graph with those three data points. When you turn in the lab, write at the top that you used the online simulator.

You also received a practice test for your test on Thursday:

Sound and Standing Waves Practice Test
Here is the key: KEY

Here are the Plickers problems from last week:
Sound Intro
Doppler Effect

Wednesday will be a work day.

Standing Waves Part 2

Today we discussed the standing longitudinal waves that can form inside a hollow tube. This is how wind-based instruments work.

Notes: Standing Waves Part 2

No official homework tonight, but tomorrow you will have a work day and are expected to finish these things:

p.506 CON #10
p.510 #41, 46, 51, 52a
2015 FRQ5

If you want to get a head start tonight, feel free to do so.

Standing Waves Part 1

Today we started talking about standing waves and how stringed instruments create certain frequencies.

Notes: Standing Waves Part 1

There are a lot of sites we visited and videos that we watched; they are linked in the Powerpoint.

You do not have any homework tonight because you have the SAT on Wednesday. Instead, you will be given some practice work from today and Thursday on Friday.

Doppler Effect

The Doppler Effect is one of my favorite things!

Notes: Doppler Effect

Suggested homework is Ch. 14 (p. 505) Multiple Choice #12 + Conceptual #1, 7, 8.

We will have several Pickers problems tomorrow, covering stuff from this week and maybe some really old review too.

Test: SHM and Waves

Today was your test covering simple harmonic motion and waves. If you missed this test, please make it up by Tuesday so I can give them back.

Sound, Resonance, and Beats

Today was a conceptual day, with demos and videos involving waves and sound.

Notes: Sound Intro, Resonance, and Beats

Suggested homework is p.505 Multiple Choice #9 + Conceptual #6 & 11

For those that asked, here is the video of the boy breaking the glass:

Boy Breaks Glass With Voice

If you try this yourself, PLEASE wear eye protection and do not use someone's nice glasses. Go get some wine glasses from a thrift store or something.

EM Waves

Today was a half day, so we very briefly discussed a type of non-mechanical wave called an electromagnetic (EM) wave.

Electromagnetic Spectrum
United States Frequency Allocations (NASA)

Homework: p. 468 #28 & 43

Mechanical Waves

Here are the notes for today:



Here is a website with animations of the different kids of mechanical waves:

Acoustics and Vibrations Animations, Daniel A. Russell, Pennsylvania State University

Here is the stuff about earthquakes:
Types of Seismic Waves (L. Braile, Purdue)
Seismic Waves (YouTube)


Suggested homework: p.469 #41 & 44.

Lab: Speed of Sound in Air

Today you are completing a lab to verify the speed of sound in air:

Lab: Speed of Sound in Air

Here are some tips/reminders that were on the board:

If you missed this lab, there is a way to do it online, but it's a bit involved. You will have to use two different simulators.

This simulator is the best because it explains the lab and most closely emulates the physical process involved: http://physics.bu.edu/~duffy/HTML5/speed_of_sound.html

The only problem is that it only has 3 available frequencies, and we need at least 6 for a good graph. So while I want you to play with this applet, I want you to actually get your data with a different applet:

http://www.physics.smu.edu/~olness/www/05fall1320/applet/pipe-waves.html

You will need to follow the download instructions and run it off of your computer, not in the web browser window. It may not want to run at first because it uses an old version of Java, but just keep hitting “run anyway” and it will work. In the applet, choose “one side open” under "Form of tube" and make sure "Vibrational mode" is set to "Fundamental." Then you can put in different lengths of tubes and write down the frequencies it gives. This is sort of backwards from the real lab, in which we are choosing frequencies and finding the corresponding lengths of tubes, but you will get the same frequency vs. length data in the end.

You also received a practice test for your test on Thursday:

Sound and Standing Waves Practice Test
Here is the key: KEY

Wednesday will be a work day.

Sound and Harmonics

Today we just looked at a few things that I didn't have time for earlier in the week:

Harmonic Waveform Generator from meettechniek.info

Veratasium: 2-D Ruben's Tube

Steve Mould: Laser + Mirror + Sound (we only watched the first 5 minutes or so)

Brusspup: Amazing Water and Sound Experiment

You do not have any homework tonight. If you are missing any homework, especially for this unit, please work on that.

Coming up:

• You have a test next week on Thursday. The test grade will not go on the quarter grade.
• You have a lab on Monday/Tuesday that you will be turning in instead of just getting it checked. It will not go on the quarter grade.
• You have a work day next Wednesday. You can pick up the practice test today if you want it.
• The last day of the quarter is Thursday. I have to submit quarter grades on Friday. If you want something to make it on to the quarter grade, you need to turn it in soon.

Standing Waves Part 2

Today we discussed the standing longitudinal waves that can form inside a hollow tube. This is how wind-based instruments work.

Notes: Standing Waves Part 2

Homework is p.506 CON #10 + p.510 #51 & 52a

Standing Waves Part 1

Today we started talking about standing waves and how stringed instruments create certain frequencies.

Notes: Standing Waves Part 1

There are a lot of sites we visited and videos that we watched; they are linked in the Powerpoint.

Homework is in two parts and you probably got a good start in class:
p.510 #41 & 46
AND
2015 FRQ 5 (this is an old FRQ from the AP test).

Wave Interference and Reflection

Today we talked about what happens when waves overlap or hit a barrier/change mediums.

Notes
Simulations:
Zona Land Education: Wave Interference I
Zona Land Education: Wave Interference II
Zona Land Education: Wave Interference III
PhET: Wave on a String

Homework: There is almost nothing to practice interference in the textbook, so your homework tonight is to play a game. Download the app Kerflux and get to at least level 30. Please note you do NOT have to pay anything for this game. If you do not have a device that can run Kerflux, that's okay too; I'm not actually checking this.

On Wednesday you will have a work day to prepare for your unit test.

Your unit test is on your next modular day. Below you will find a link to the practice test as well as a key.

SHM and Waves Test Practice

Solutions videos (note that the numbers of the problems have changed but the problems themselves have not):
#9
#10
#11
#12

EM Waves

Today was a half day, so we very briefly discussed a type of non-mechanical wave called an electromagnetic (EM) wave.

Electromagnetic Spectrum
United States Frequency Allocations (NASA)

Homework: p. 469 #43, 45, 46

Mechanical Waves

Because I will be out next Wednesday, I have had to rearrange some things, and that means today we are taking a little break from SHM to talk about mechanical waves. We will go back to SHM on Monday/Tuesday with another lab, so bring your lab notebook next time. I will also be checking your Period of a Spring Lab on Monday/Tuesday.

Here are the notes for today:



Here is a website with animations of the different kids of mechanical waves:

Acoustics and Vibrations Animations, Daniel A. Russell, Pennsylvania State University

Here is the stuff about earthquakes:
Types of Seismic Waves (L. Braile, Purdue)
Seismic Waves (YouTube)


Homework: Ch. 13 (p.469) # #41, 42, 44.

Lab: Speed of Sound in Air

Today you are completing a lab to verify the speed of sound in air:

Lab: Speed of Sound in Air

Here are some tips/reminders that were on the board:

If you missed this lab, there is a way to do it online, but it's a bit involved. You will have to use two different simulators.

This simulator is the best because it explains the lab and most closely emulates the physical process involved: http://physics.bu.edu/~duffy/HTML5/speed_of_sound.html

The only problem is that it only has 3 available frequencies, and we need at least 6 for a good graph. So while I want you to play with this applet, I want you to actually get your data with a different applet:

http://www.physics.smu.edu/~olness/www/05fall1320/applet/pipe-waves.html

You will need to follow the download instructions and run it off of your computer, not in the web browser window. It may not want to run at first because it uses an old version of Java, but just keep hitting “run anyway” and it will work. In the applet, choose “one side open” under "Form of tube" and make sure "Vibrational mode" is set to "Fundamental." Then you can put in different lengths of tubes and write down the frequencies it gives. This is sort of backwards from the real lab, in which we are choosing frequencies and finding the corresponding lengths of tubes, but you will get the same frequency vs. length data in the end.

You also received a practice test for your test on Thursday:

Sound and Standing Waves Practice Test

Wednesday will be a work day.

Pre-Lab and Work Time

Today you first took back your 2015 FRQ 5 from earlier this week and graded it yourself. You then turned that back in and you will receive participation points for completing it and grading it.

Next we talked about the lab we'll be doing next week and gave you time to work on the pre-lab and lab procedure. Please be ready to start taking data next class.

Lab: Finding the Speed of Sound in Air

Miscellaneous

Today we just looked at a few things that I didn't have time for earlier in the week:

Harmonic Waveform Generator from meettechniek.info
Michael Norris: Harmonic Series Calculator

Veratasium: 2-D Ruben's Tube

Steve Mould: Laser + Mirror + Sound (we only watched the first 5 minutes or so)

Brusspup: Amazing Water and Sound Experiment

You do not have any homework tonight. If you are missing any homework, especially for this unit, please work on that.

Coming up:

• You have a test next week on Thursday. Several of you have told me you will be gone for school business; you might want to take it early on Wednesday after school. The test grade will not go on the quarter grade.
• You have a lab on Monday/Tuesday that you will be turning in instead of just getting it checked. It will not go on the quarter grade.
• You have a work day and a practice test tomorrow
• The last day of the quarter is Thursday. I have to submit quarter grades on Friday. If you want something to make it on to the quarter grade, you need to turn it in soon.

Standing Waves Part 2

Today we discussed the standing longitudinal waves that can form inside a hollow tube. This is how wind-based instruments work.

Notes: Standing Waves Part 2

Homework is p.506 CON #10 + p.510 #51 & 52a

Standing Waves Part 1

Today we started talking about standing waves and how stringed instruments create certain frequencies.

Notes: Standing Waves Part 1

There are a lot of sites we visited and videos that we watched; they are linked in the Powerpoint.

Homework is in two parts and you probably got a good start in class:
p.510 #41 & 46
AND
2015 FRQ 5 (this is an old FRQ from the AP test).

These are due THURSDAY because of the SAT on Wednesday. I would rather that you focus on the SAT now and do these Wednesday night.