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?)