october 27/10

we got our test back and we did had to do the tactile, emission, particle and wave theory/draw to in one of the pages miss. K handed out. Plus we got another work sheet called unit conversions: and the answer for those are
1) 6000m
2)4900g
3)75mm
4)3210cg
5)56m
6)0.76kg
7)4500000m2
8)1.23kg/L
9)1.2x10 to the po

October 29, 2010

At the beginning of the class, we went over our tests about Nature of Light Part 1. Mrs. K gave us each and every detail from it. Then, Mrs. K introduced a new lesson entitled Nature Of Light Part 2: The Wave and Particle Models of Light. We then highlighted some important details in the first topic and learned 4 theories that are developed ages ago.

We were given two handouts:
Unit Conversion (for conversion practice.)
A worksheet that you are asked to explain how each theories (Tactile, Emission, Particle, Wave) describes light. You are also asked to draw a picture at the back of it. (It needs to be handed in on Monday! Be sure to do it!)

October 27th, 2010

Today in class, we went over the answers for worksheets:

• Transparency 1-1
• Transparency 1-2
• Transparency 1-4

Ms. K uploaded the answers to Slideshare, and can be found in the previous post or here.

We were also given the optional worksheet titled
Reinforcement: Determining Relationships from Graphs,
which was more graphing practice.

There's a test tomorrow on this unit; make sure you know the basic elements of a graph (giving names for the axis and having the units for them in brackets, going up by appropriate units on the graph, an appropriate title that describes the graph, knowing what kind of relationship the graph is showing, etc). Good luck

Nature of Light Part 1

Nature of light part 1

View more documents from ekozoriz.

October 18, 2010

Today we did a lab where we had a "mystery box" that we had to shake and write an "observation", a "conclusion", find a "pattern" and draw a diagram for. For example, your observation can be the different types of sounds you hear while shaking the box, like the sound of a bell or sounds of metal tapping against each other. Your conclusion is what you think is in the box, and the pattern will be the continuation of a sound you hear while shaking the box a certain way. After doing the observation, conclusion, and finding a pattern, we were to open the box and draw down the diagram of what we thought was in the box, and what was really in the box. After we were done, we had to hand in our lab in order to get our test returned to us.

October 14th

In today's class, we did three questions from our booklet which was questions 21(a,b,c) 22 and 26.
We also went over on what to review on the upcoming test. The review included pages from the booklet or the "summary" near the end if a condensed version of the whole thing is wanted instead(not including the page 14 sound perception/sound wave characteristics guide.

October 13, 2010

We made a straw oboe by trimming the end of a drinking straw and placed the flattened double reed part of the straw oboe between our lips to play it. We learned that the reed vibrates to make sounds. We also did some problems from the sound unit booklet.

Concept-Development Practice Page 26-1

Concept-Development Practice Page 26-1

Sound:

1) Two major classes of waves are longitudinal and transverse. Sound waves are:

Answer: Longitudinal

2) The frequency of a sound signal refers to how frequently the vibrations occur. A high-frequency sound is heard at a high:

Answer: Pitch

3) The sketch questions answer would be: 2.5

4) Compared to the wavelengths of high-pitched sounds, the wavelengths of low-pitched sounds are:

Answer: Long

5) Suppose you set your watch by the sound of the noon whistle from a factory 3 km away:

a. Compared to the correct time, your watch will be:

Answer: behind

b. It will differ from the correct time by:

Answer: 9 seconds

6) Sound waves travel fastest in:

Answer: solids

7) If the child’s natural frequency of swinging is once each 4 seconds, for maximum amplitude the man should push at a rate of once each:

Answer: 4 seconds

8) If the man is Question 7 pushes in the same direction twice as often, his pushes:

Answer: will not

Be effective because

Every other push will oppose the motion of the swing

9) The frequency of the tuning fort is 440 hertz. It will NOT be forced into vibration by a sound of:

Answer: 220 hertz

10) Beats are the result of the alternate cancellation and reinforcement of two sound waves of:

Answer: slightly different frequencies

11) Two notes with frequencies of 66 and 70 Hz are wounded together. The resulting beat frequency is:

Answer: 4 hertz

12) The accepted value for the speed of sound in air is 332m/s at 0⁰C. The speed of sound in air increases 0.6m/s for each Celsius degree above zero. Compute the speed of sound at temperature of room you are now in:

Answer: 332m/s+ (0.6) (20⁰C)

=344m/s @20⁰C

Sound Unit

Today we began to study "Sound" for our next lesson. To start this lesson off we did a lab. Using a ruler, tuning fork, cylinder and water, we learned how to create sounds with them and how to vary their pitch. The material covered was somewhat new to me and from what we learned so far I don't think it's a hard concept to understand.

october 1/2010

today we had our UNIT test :)
hope you all did good ;)