Physics 7C
DLM 02 Overview
DLM 02
Model:
Plane Waves
Act 8.1.3
Representing a 1-D Harmonic Wave Graphically
(~90 min)
Learning Goals:
•
Understanding that the displacement of the medium when a harmonic wave is present depends on
two parameters: position and time
•
Understanding that it takes two graphs, one as displacement of medium vs. time and one as
displacement of medium vs. distance to completely represent a wave graphically
•
Understanding that the graph of a harmonic wave as a function of either position or time is
sinusoidal (i.e., corresponds to a sine or cosine function)
•
Understanding that it takes a mathematical function of two variables (e.g., y and t) to represent a
wave (i.e., a wave function)
Act
8.1.4
Waves and the Wave Equation
(~50 min)
Learning Goals:
•
Solidify ideas about wave parameters and graphing waves
•
Understand that
y(x,t) - y
0
=
Asin 2
π
t
T
±
2
π
x
λ
+
φ
⎛
⎝
⎜
⎞
⎠
⎟ =
Asin
Φ
(x,t)
is the 1-D harmonic wave
function and that when graphed as a function of either x or t, while holding the other variable
constant, a sine wave results.
•
Begin understanding the total phase
Φ
(
x,t)
Reading Assignment
•
Read the first portion of the 7C Course Notes on Waves.
(available online)

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