PS+7+-+3rd+Period+Brown

//Wave--//A rhythmic disturbance that transfers energy //Energy--//A force of exertion on an object. //Sound Wave--//The mechanical disturbance caused by a force moving molecules in the medium through which it passes. //Light Wave--//Energy that can be transmitted without mechanical disturbance of the particles of a medium //Electromagnetic Wave--//A wave that travels through a medium, but do not need a medium for transmission. //Mechanical Wave--//A wave that must have a medium through which to move. //Transverse Wave--//Waves that move through the medium in a direction that is perpendicular(up and down). //Longitudinal/Compressional Wave--//The wave moves through the medium in a direction that is straight across. //Crest--//The point of maximum displacement of the particles in a medium from the equilibrim. //Trough--//Same as the crest. //Compression--//A part of the longitudinal/compressional wave. //Rarefaction--//The opposite of a compression. //Wavelength--//The distance between two crests. //Frequency--//The number of waves that pass by in a second. //Hertz--//Measurement of frequency. //Amplitude--//The height or the strenght of a wave. //Period--//The time for one complete wave to pass.
 * PS 7--Key concepts**


 * PS 7.1--Illustrations of Transferring of Energy in Waves

PS 7.2--Comparison of Longitudinal and Transverse Waves**


 * PS 7.3--Characteristics of Waves

PS 7.4--Formulas/Wave Problems

PS 7.5--Characteristics of the Electromagnetic Spectrum -Radio Waves** Lowest Frequency

Highest Frequency
 * Radio Waves
 * Microwaves
 * Infrared Radiation
 * Visible Light (red, orange, yellow, green, blue, violet, etc.)
 * Ultraviolet
 * X-rays
 * Gamma Rays

The lower the frequency, the longer the wavelengths. The higher the frequency, the shorter the wavelengths. The only reason why we can't see radio waves, microwaves, and infrared radiation is because the wavelengths are too long for the human eye to pick up. The only reason why we can't see ultraviolet, X-rays, and gamma rays is because the wavelengths are too short for the human eye to see. Visible light is the only wave of the electromagnetic spectrum that is visible to the human eye. [Example shown below.]
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PS 7.6--Refraction/Diffractoin

PS 7.7--Doppler Effect** The Doppler Effect is a frequency shift due to the motin of an observer and a wave source. When the wave source approaches an observer, the observer percieves a higher frequency than what the source is producing. Wavelengths are shorter and the frequency is higher in front of a moving source. [Example below.]

1.) When a transverse wave travels through a medium, which way does matter in the medium move? A) amplitude B.) wavelength C.) crest D.) trough
 * PS 7 Questions**

2.) What is the number of waves that pass a point in a certain time called? A.) wavelength B.) wave amplitude C.) wave intensity D.) wave frequency

3.) The period of a wave can be directly calculated from which of the following? A.) troughs B.) amplitude C.) frequency D.) wavelength

4.) What is the energy of a wave related to? A.) frequency B.) wave speed C.) amplitude D.) refraction

5.) What is the bending of a wave as it enters a new material? A.) refraction B.) diffraction C.) reflection D.) interference

6.) When the crests of two identical waves meet, what is the amplitude of the resulting wave? A.) three times the amplitude of each wave B.) half the amplitude of each wave C.) twice the amplitude of each wave D.) four times the amplitude of one of the original waves

7.) Through which of the following can sound waves NOT travel? A.) water B.) wood C.) outer space D.) air

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