Today we learned all about waves and sound for unit 9. We learned that a wiggle in time is vibration and a wiggle in time and space is a wave. So when you are "waving" to some one, you cannot be standing still because that wouldn't be waving, it would be vibrating. Here is a diagram of what we learned about waves:
One whole waves length includes the up loop and the down loop. It is measured from two identical places in the wave. The crest is the top of a wave and the tough is the bottom of a wave. The dotted line is where the wave is at equilibrium. A wave is just an energy flowing through a medium. A medium is the material the wave is in. Wave length can be represented by a lambda symbol.
Amplitude is the distance from equilibrium point to highest/lowest point in the wave. Period (T) is the time is takes for one whole cycle to occur and frequency (f) is how many cycles pass in a second. the unit for frequency is Hertz (Hz) or 1/sec. An equation for this is T= 1/f. Also to fin the velocity of a wave, you use the equation v = wavelength x frequency. Wavelength and frequency are inversely related. Only tension and medium affect the velocity, but the wavelength and period are directly related.
A transeverse wave is wave energy that moves perpendicular to wave velocity. A longitudinal wave is wave energy that moves parallel to wave velocity.
Your diagram is really helpful! You explained everything well and wrote clearly. I also like your rape whistle very much, and good job for explaining how a higher noise would have a higher frequency!
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