FarleyPhysics.com

1. Look at simulations:

Doppler Effect

Doppler Effect

Police Car

2. Videos:

http://science.discovery.com/videos/time-doppler-effect.html

Assignment:

Create a six square comic strip about The Doppler Effect

Square 1: Title = The Doppler Effect.  Find an image and have a large title.

Square 2: Explain what the doppler effect is like you are telling a first grader.

Squares 3-6: Show a few real world examples where the doppler effect can be heard and include an explanation of what is in the picture and what it will sound like.

1. Make sure you have an image, the wavelength, and something the same size as the wavelength.

Use: Format > Font > Baseline > Superscript to make your exponents look good

2. Make it funny!

3. Save it with your name in the title.

4. Put it on the server in the “Spectrum Comic” folder.

Go to this web site:

http://www.lbl.gov/MicroWorlds/ALSTool/EMSpec/EMSpec2.html

Open Comic Life and make a 9 square comic (page templates > Comic 2)

Square 1: The Electromagnetic spectrum.  Find a picture representing it, and The electromagnetic Spectrum as the title.

Squares 2-9 Each of the common wave names.  Include a picture representing the wave, the name of the wave in a square box, and the size of the wavelength (use 10^-3 or 10^3 for exponents).  The bubble should say something that is the same size as the wave.

Do the following web search in your notes. Put all questions and answers in your notes.  Only do #2-14.  Skip #1, 15,16,17, and extra credit.

http://www.haystack.mit.edu/edu/pcr/waves/General%20Wave%20Properties/Electromagnetic%20Spectrum%20Web%20Quest.htm

Page 6: right side: Notes on amplitude, frequency, wavelength. standing waves. longitudinal and transverse waves.

Spring Lab

BE CAREFUL with the springs.  They are easily tied in a knot, kinked, and if one person looses grip, that end can smack the person on the other end hard.

1. Stretch your spring and have the person on one end pluck it like a guitar string.  Draw a picture of the wave in your notes.

2. Have each person holding the spring pluck the spring and observe what happens to the pulses.  Do they bounce off one another or go right through?  Is this a transverse wave or a longitudinal wave?

3. Tie a string to the center of your spring.  Now have someone grab the spring at any point and pull it away from one of the holders and closer to the other holder.  It should be stretched on one side, and compressed on the other.  Let go and notice the wave produced.  Which direction does the spring material move as the wave passes? Is this a transverse or longitudinal wave?  Draw this in your notes.

4. Now have one person slowly go up and down with the spring like a jump rope, but not in a circle.  What you make is one big wave where you only see half of the wave.  Can you figure out the wavelength of this wave?  Draw the spring, the entire wave, and label the wavelength you measured.

5. Speed up the oscillation until you have one entire wavelength between each person.  Measure the wavelength.  Draw this wave in your notes and label the wavelength.

6. Speed up your frequency even more until you have two whole wavelengths.  What is your wavelength now?  Draw this wave in your notes and label one wavelength.

7. What is the shortest wavelength you can make with the spring?  Be very careful when you are trying this.

8. What is the relationship between the frequency of your up and down and the wavelengths on the spring? (when frequency _________________, the wavelength ____________________.)

In teams of  two, you will create a presentation on one of these wave properties.

Here is a good site to find basic information about Light and Sound.

Wave Frequency

Wave Amplitude

Wave Wavelength

Transverse Waves

Longitudinal Waves

Speed of Light and Sound

The Doppler effect

Refraction of light

Dispersion of Light

Light Reflection

Light Diffraction

Wave Interference

Red shift

Seismic waves (what are P-waves and S-waves)

Resonance

Standing waves

Gravitational Waves

Beats
Two sounds close in frequency create “beats.”

Each presentation will have the following:

6 slides:
Slide 1: Title with group members

Slide 2: What is it, how does it work, or a definition?

Slide 3: A simulation or applet that shows how it works or what it is.  Link to the web page with the applet (google search for “dispersion applet” or “Wavelength simulation”. ) Or, if you can’t find a good one, find a graphic that shows it

Slide 4: A common thing that we all see or hear that is a result of it.  Show a picture.

Slide 5: A quiz/test question and answer on identifying the topic when you see it.  non-mathematical.  The answer should be multiple choice with your subject in the answers.  like this:

___Light that hits a mirror and bounces off at the same angle it hits at.  This is called?

a) dispersion
b) beats
c) reflection
d) diffraction

Slide 6: should have the answer.

To link to another website, highlight the text, go to the inspector (blue i), click the blue arrow icon in the inspector, select “create hyperlink” and put the URL in the box.

Each group will give a 2 minute presentation on Thursday and we will have a quiz on Friday on all the properties.

Waves carry energy from one place to another, there are different types of waves that travel in different media, but they all carry energy.

Use this applet for the next few questions.

1. Raise the wrench up and down quickly and watch the pulse on the string move.  Draw a picture and describe what happens to the pulse.

2. Turn Damping to zero and do it again.  Draw a picture and describe what happens to the pulse when it hits the other end.

3. Click Loose end and No end and describe what happens to the pulse for each.

4. Set the applet to “Oscillate” and “no end.”  Run it for a bit and then pause it.  Click on the rulers and measure the distance between two peaks.  This is called the wavelength of the wave. Draw a picture of the wave, with the ruler, and label the wavelength of the wave on your drawing. (remember to PAUSE it to measure)

5. Increase the amplitude of the wave and remeasure the wavelength.  Does wavelength change when amplitude changes?  Write a statement in your notes: “Wavelength does/does not depend on amplitude.”

6. Increase frequency.  Does wavelength depend on frequency?  Write this statement in your notes. “When frequency is increased, the wavelength…”

7. If you double the frequency of a wave, what happens to its wavelength?  Write this as a statement.

Use this applet for the next few questions.

1. Wiggle the electron in the radio station’s antenna and describe the wave.
How is it like the wave on a rope?
What happens to the electron in the house antenna a little time after the electron wiggles?

2. Set the electron to oscillate.  Draw a picture and explain what happens to the house electron?

3. Increase the frequency of the oscillated electron.   What happens to the antenna electron?  (This is how FM radio stations work, they change the frequency of the wave to send the music signal FM = Frequency Modulation).

4. Increase the apmlitude (this is how AM is sent) Explain this in a sentence or two and draw a picture.

5. Click “full field” and see how radio waves really work.  Explain what you see and draw a picture showing the wave traveling out of the radio wave (don’t draw all the arrows, just circles representing the wave crests).

1. Temperature

2. heat

3. First Law of Thermodynamics

Heat is when energy passes from one object to an another.  It is measured in Joules.  Heat follows the law of conservation of energy, which states that energy can not be created or destroyed, but it can change forms.

Questions:

First Law of Thermodynamics (conservation of energy)

1. If 10 J of energy is added to a system that does no work, by how much will the internal energy of that system be raised?

2. If 100 J of heat is added to water in a sealed can that cannot expand or let heat out, how much is the internal energy of the water increased?

3. If 100 J of heat is added to a balloon, and the balloon expands doing 10 J of work, how much is the internal energy of the balloon raised?

4. If a piston in an engine has 1000 J of energy pumped into it in the form of gasoline and the piston does 700 J of work, how much is the internal energy of the piston raised?

5. If the heat in #4 is released as exhaust, how much energy is released?

6. If an engine has 500 J of heat added to it and doest 300 J of work, how much energy is released as exhaust?

7. An engine has an input of heat energy of 10,750 J and does 2420 J of work.  Which of the following is the heat loss?

1. A steam engine has a high temperature reservoir at 800 K and a low temperature reervoir at 300 K.  When the engine is running, it extracts 400 J of energy from the hot reservoir and does 250 J of work.  How much energy is expelled to the low temperature reservoir?

Second Law of Thermodynamics (Entropy)

1. Draw a picture in your notes of something with low entropy and something with high entropy.  Label each drawing.
2. Greater order is ___________ entropy and more disorder is _____________ entropy.
3. For each of the following, explain if entropy is increasing or decreasing and explain why:

A snowball melting, water freezing, an iron nail rusting, you cleaning up your room, a rock falling, a bomb exploding.