Lesson+24+&+25

**﻿Advancememt in Physics @ Dwight Englewood** **Director: Elise Burns** **TA: Sebastian Luh**

Vibrations: wave length : distance between a point on a wave and the same point on the next wave amplitude : always from equilibrium frost crest to trof period of a wave: inseconds time of one wave how to measure speed of a wave ? wavelenght / period or d/t

**Speed = Wavelength x Frequency** reflection: bouncing off of an object



refraction: the chage in direction from onemedium to another, :"bending" the path of waves by a change in wave speed frequency nd wavelegth does no change wavespeed but more frequuency change media wave speed changes but freququency wil stay constant



diffraction: change in direction of waves as they pass through an obstacle an opening or around



interfernece: when 2 waves met while traveling along the same path








 * Discussion Questions**
 * 1)  How do the speeds of the waves compare for the 3 different amplitudes of the 5.0 meter distance? __??__
 * 2)  Did amplitude influence the speed of the waves for the 5.0 meter distance? No the amplitude did not influence the speed of the waves for the 5 meter distance.
 * 3)  How do the speeds of the waves compare for the 3 different amplitudes of the 10.0 meter distance? The speeds of the waves compare to the 3 different amplitudes of the 10 meters were constan, except for an increase of .01 meters in one of the two trials.
 * 4) Did amplitude influence the speed of the waves for the 10.0 meter distance? The amplitude influenced the speed of the waves for the 10 meter distance. The snakey lab had a very miniscule change while the lab with the slinkies change was greater.
 * 5) How do the speeds of the waves compare for the 5.0 meter and 10.0 meter distances? The speeds of the waves were pretty related beause tehy had the same behavioral patterns.
 * 6) What changed when you measured the time for 10-m vs. the 5.0-m distance? Choose as many as apply.
 * The medium changed.
 * The wavelength changed.
 * The speed changed.
 * The frequency changed.
 * 1) How do the speeds of the waves compare for the 2 different types of springs? The speeds of the waves differed from the slinky being fast and the snakey taking longer.
 * 2)  W<span style="font-family: Tahoma,Geneva,sans-serif;">hat are some differences between the longitudinal and the transverse wave?  Longitudinal particles oscillate parallel in the direction the wave travels and there is rareftion and cmpression while in transverse waves the particles are perpendicular the the path of the waves have a //crest// at maximum and //trough// at minimum.



Note to self: What Lesson is this ??