April 28, 2011

At the beginning of the class, we continue reading on page 17, Sound Quality. We learned that the sounds made by the human voice and musical instruments are much more complex and sound differently even though some instruments give off the same frequency. In musical terms, the difference between the two waves is called the timbre(TAM-bər), tone colour or tone quality. We also learned that the "Middle-C" on a piano has a frequency of 261.63Hz, but on the Just Scale system, middle C has a frequency of 256, this is what we are going to use.

Diatonic Scale consists of three major triads.

Major Triad is a collection of three notes with frequency in the ration of 4:5:6. If you want to know the frequency of E or G note, you just have to use the ratio between notes (e.i. C note is 256, then the frequency of E note is (5/4)(256) which is 320Hz).

Octave consists of interval between a given musical tone and one with double or half the frequency.

We finished reading pages 17-19 and if you want to know some important definitions and summarization of the whole booklet, go to pages 22-23. Finished correcting the homeworks given to use yesterday.

I think that's all, anyways be ready for the TEST NEXT WEEK and ENJOY your long weekend!

P.S. Anyone wants to scribe for Monday, May 2nd?

April 27, 2011

For today's class, Ms. K gave us the time to finish up the lab activity involving the speed of sound. We also checked the homework from pages 26-27 (#10-16) of the Sound Unit booklet.
Grade 11 Physics: Unit 1.3 Sound and page 26 #17-20 will be check the next day.

Just a reminder that the lab is due on the day of our test, which is next week, Monday (i'm not sure if that is the date). The whole booklet will be handed-in that day.

I forgot to scribed for this day so i am going to work double shifts. haha.

Lab Activity: Speed of Sound

For today's class, we did a lab activity involving the speed of sound. Using a 1000-mL graduated cylinder, a glass tube that was approximately 40cm in length and 3.5cm in diameter, water, metric ruler, thermometer (non-mercury), 3 tuning forks with different frequencies, and also a tuning fork mallet, we were able to do perform the lab.

The objectives of this lab:
- Collect and organize data to obtain resonant points in a closed pipe.
- Measure the length of a closed resonator.
- Analyze the date to determine the speed of sound.

To perform the lab, measure the air temperature inside the glass tube, as well as its diameter, that is placed inside the water-filled graduated cylinder. Once this is done, strike the tuning fork, while holding it by the base, and place the vibrating fork over the open end of the glass. Then slowly raise the glass tube and the fork until you hear the loudest sound produced. Once you've figured this out, measure the distance from the water to the top of the glass tube and record this data.

*To completely figure out how to do this lab, the objectives and procedures are found on pages 28-30.
*Questions for this lab is found on page 30.

NOTE: This lab is due on the day of our test, which maybe next week. The whole booklet will be handed-in that day.
: For tomorrow's class, pages 26-27 (# 10-16 ) of the Sound Unit booklet will be checked.

Next scribe: Eric Vitug

April 25, 2011

At the beginning of the class, we checked the homework in the booklet given to us last Friday.

Pages 24-25; #1-12. Also, recent lab we had have been given out by Ms. K, its the one with the magical ruler, tuning fork thing.

Midway through the class we watched several clips pertaining to the characteristics of sound waves. Reading through the booklet would help understand the concept.

After watching the short clips, we were just given some more work from the booklet. Pages 26-27;#1-16 until the rest of the class to work on it and that's all. :))

Next scribe: Karla.

April 21

This class was all about correcting the test paper that Mr. Vincent had given us.

It was all about Refraction, Reflection Diffraction.

The multiple questions was not that difficult.
These answers are in order.
d,c,c,c,d,b,c,a,c,c,destructive interference, index of refraction, increase, wave ray, focal point.

Part B and part C was rather challenging for some people.

Here are the important labels in question number one. normal, incident wave front, incident wave ray, angle of incidence, barrier, refracted wave front, refracted wave ray, angle of refraction. What is happening is that the wave is coming from a shallow water to a deep water. In question number two, it was all about diffraction. As water waves enters an opening some will LAG behind when hit by the barrier. Two conditions which are required to maximize the phenomenon is the larger the wavelength the greater the diffraction and the opening should be smaller. Number three is where a parabolic reflector must be labelled.

Part C and D are calculations about Snell's Law and the interference pattern.




We are now in the sound unit.

Dwight already mentioned the definitions involved in this unit. The task is to READ PAGES 3 TO 10 IN THE PINK BOOKLET AND ANSWER PAGES 24, 25...... AND ON PAGE 26, ANSWER 1 TO 9. IF YOU HAVE SPARE TIME, FEEL FREE TO ANSWER PAGE 32. THE WORD SEARCH PUZZLE.



HOPE YOU GUYS HAD A GREAT WEEKEND. :)

Next scribe is VaNiLLa_iScream

Sound Waves

Definition for Today Class’

Resonance - Rhythm with which you push, produce a large amplitude.

Sound of Reflection - the repetition of a sound resulting from reflection of the sound waves. (Echoes)

Sound of Refraction - The turning or bending of any wave, such as a sound wave, when it passes from one medium into another of different optical density.

Forced Vibration — The oscillation of a system under the action of a forcing function. Typically forced vibration occurs at the frequency of the exciting force.

temperature inversion - condition in which the temperature of the atmosphere increases with altitude in contrast to the normal decrease with altitude.

Out of Phase - an unsynchronized of sound

On the beginning of the class Ms K. Hand back our notes that we done yesterday. Ms K. show another video of Paul Hewitt about Sound Wave. On the first scene of the video, Paul talked about how the dolphin communicates to each other. He also talked about which sound will travel fastest, is it in Cold weather or Warm weather? à Paul answer is warm weather, because the air is less dense and also a collision of molecules of air in warm air is greater. Paul Hewwit also talked the gAng about which can you hear well is it Day time or Night time. à Paul answer is Night time, because the sound waves are bent when they travel from cold air into warm air. (Related: Refraction of sound).

Also he demo to the video how does resonance work. Click the link below to view the demo. à http://www.youtube.com/watch?v=zWKiWaiM3Pw&feature=fvwrel

. ‘’ It is not how hard you push the swing it is about the rhythm how you push the swing’’ à(Resonance)

After Paul lecturing to the gAng, he show the video about the Tacoma Narrow bridge that was a tragedy to the Washington people where the Cat fault... kiddingJ. The bridge collapse because the oscillating of the wind into the bridge. After the cat destroyed the bridge the video ended and Ms K gave us some time to finish our lab report but luckily she gave us more time to hand in the lab tomorrow. Ms K asked us to read the booklet page 1-6.

Next Scribe: BryanC.

April 18 and 19, 2011

Yesterday we had our Waves in 2D test. It took the whole period so that was all for yesterday.

Today we talked about Sound. We watched a video with Paul Hewitt. Most of the beginning was review of what we already learned (parts of a wave, kinds of waves, how to find frequency/period, etc). The rest of the video was describing how CD's work in comparison to Records, how frequencies of Radio Waves operate, a man had this machine showing how sound waves are produced, and how someone who could invent a better windshield wiper could be rich.

After the video we got a lab that is due at the end of tomorrow's class. The lab was about sound and how to produce them. We used rulers (part of the ruler on the table with some hanging off, and plucking it), tuning forks (hitting them with a rubber hammer), and graduated cylinders (filled with water at different levels and blowing against the top).

The sound unit will go onto next week with a test on Thursday (from what I remember).

Sorry this is late (I forgot :D?)

April 15th

Today in class we did our review for the upcoming test on Monday. We learnt about Reflection, Refraction and Diffraction plus a bit in Harmonics and Standing Waves . Today was also the day the labs were due so hopefully everyone got the chance to hand in their work.

Well that was pretty much what happened in class, we just answered questions (Mr.V answered them and explained them) and labs were handed in. By the way Mr. V said he'll be posting the questions up just incase anyone missed them.

Have a great weekend everyone! And don't forget to study for the test on MONDAY!!! :)

Waves in 2D test review

Here is the review for Monday's Unit test. Please make sure you go through as much of it as possible. Also, please make sure to review your notes, especially the summaries at the end of each lesson and the examples we worked through. Don't forget, there will be one maybe 2 questions on harmonics and standing waves. They will be very similar to those provided in the review. Best of luck, have a good weekend.

Mr V.

Waves 2 d test review

April 13th & 14th

Hi everyone, sorry I forgot to scribe for yesterday therefore I'm scribing for today and yesterday. Yay!

April 13th

Today we did a lab called "Snell's Law and the bending of light waves."

The lab was to observe light when it bends and to figure out the refraction of water

- The LAB IS DUE FRIDAY!!! :)

P.S. Talk to Mr. V if you missed the lab and if you have any questions about it

April 14th

Well, for today's class we worked on the lab questions

BTW Mr. V added that the graph should be labeled with a legend (adding colour wouldn't hurt too) and dont forget a title plus you and your partner each need a graph and seperate answer sheets for the questions :)

Dont forget to not miss tomorrow's class we will be having a review for our test on the unit on MONDAY.

Nikki will be scribing for tomorrow

April 12, 2011 Wave Interference In two Dimensions

at the start of the class we answered the exercises given by Mr. V and review for a bit about Diffraction.. (the larger the wavelength and the lower the frequency the greater diffraction we can have regardless of how large or how small the barrier is) ..He also gave us the notes for that lesson.

the next part he gave us the note for today's lesson Wave Interference in Two Dimensions..
he showed us two circular waves meeting each other to show the constructive and destructive interference happened between the two waves..

a constructive interference will occur in a crest to crest or trough to trough while the destructive interference can be produced when a crest and trough met. we also took up about nodal lines.. nodal lines are produced when a constructive and destructive interference are produced..

we can also calculate the wavelength of waves producing an interference pattern.. Its in the notes given, memorize and it will help..

that's all and if I'm not mistaken we will be having a lab tomorrow, and be ready for the test on Friday(if not postponed).

There is a volunteer to scribe next..

God bless to all and have a sweet dreams..

Friday April 8th

Handed in 3 reflection assignment for marks
received refraction notes from page 13-19
given pg 10 of refractions for homework due on monday

Monday April 11th

we started to learn about DIFFRACTION
we looked at notes on the smartboard, that we will receive from mr. vincent as soon as possible
we received pages 26-27 on diffraction for homework due tomorrow

april 6th

well today we covered irregular wave fronts and circular wave fronts and straight wave fronts.we also covered reflected and incident waves
Mr.Vincent is going to be putting up all the notes up here so there really is no point in doing this.
our physics standing waves and extra practice worksheet are due Friday.
the next scribe shall be sa

April 4th/2011 Physics

For class today we received 9 pages of notes and 3 pages of homework. We learned what standing waves, nodes (nodal point) and antinodes (loops) are. We also learned what a resonant frequency (natural frequency), fundamental frequency, harmonics, and overtones are. We got a good amount of notes that we should review before next class and we have to answer the standing wave questions #1-4 and harmonic questions #1-5 by next class. The next blogger will be Ahmed Rage for the next class.