Physics Notes 2/5 by Jess

Diffraction- wavelength vs sive of opening
small opening-more diffraction
large-less diffraction

Resonance- increased amplitude of oscillation of a mechanical system when subjected to vibration at or near its own natural frequency

(insert Julia's "Oh, S***!" here)

Natural Frequency- frequency at which objects tend to ocillate when disturbed
-if objects are excited at natural fequecny, the aplitude of vibration will increase
-Electrical circuits also exert electricity
Example: pushing a swing, or musical instrument

February 2, 2008

The class on Wednesday began with a little speech by Mr. Wirth on how we should not be second semester seniors and try to do out best in school (or in Katie’s case "second semester junior")

Then we moved onto the wave concepts that we have covered and that will be on the quiz this Friday:
- Waves transfer energy without transferring mass
- Mechanical vs. non-mechanical
- Electromagnetic waves are non-mechanical, everything else is mechanical
-Remember that "cell phones do blow up in microwaves"
- Transverse vs. longitudinal
- Phase
- Interference
- Constructive interference
- Maximum for zero degree phase difference which is the same as a 360 degree phase difference
- Destructive interference
- Maximum of 180 degree phase difference
- Pulse vs. periodic wave
- Amplitude is related to energy
- Period
-Frequency
- Wavelength
- Speed dependent on the medium
- Frequency dependent on the source
- Diffraction
- Standing waves
- Resonance
- Doppler Effect

NEW MATERIAL:
Next we learned new material. However, this material will not be on the quiz this Friday only the information listed above

Light:
- Lights is a transverse wave consisting of energy in the form of electric and magnetic fields
- These electric and magnetic fields vibrate and right angles to the direction of movement of the wave, and at right angles to each other
- Light is also referred to as electromagnetic radiation
- Light that humans can sense is called visible light

Light Video:
- Thomas Young proved that light is a wave because of wave interference

Speed of Light:
- Symbol: c
- All mathematical information needed for speed is located on the reference table

Light Video:
- Light has many different "flavors" identified by wavelength
- All wavelengths make up a spectrum
- Visible light is 700 to 400 nm
- Gamma rays:
-Most energy
- Smallest wavelength
- High frequency
- Ultraviolet rays:
- Cause sunburn
-Wear Sunscreen
- Light is sometimes called radiation

Electromagnetic Spectrum:
- Visible light is red to violet
- Red light has long wavelengths and low frequency
- Ex. radio waves
- Violet light has short wavelengths and high frequency
- Ex. gamma rays


QUIZ ON FRIDAY!!

- know two equations
v= (f) (lambda)
t= 1/f


First period physics enjoys listening to Hannah Montana


Breakfast Club Countdown: TOMORROW!!!

2-4-2008

Today we went over interfence Patterens witch can cool looking patterens like:

we also learnded that interferfence can change the colors you see such as in a rainbow beacuse the prism causes interferance.

then we learned about Nodes and Anti- Nodes
Nodes: are when the displacment is zero because waves cancle

Anti- Nodes: are when waves are in phase and peek together to create a higher crest

Finaly we Learned about interfaces. Interfaces are when the Medium that the waves travels throught changes.

Then for are lab we played with a Hydro Acustic Resonatior to make the sound of the tuning fork laoder.