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Physics 7C SS1Lecture 2: Wave Model

1D & 2D Wave Review

Phase Constant vs. Total Phase

Introduction to Interference

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Longitudinal vs. Transverse Wave Polarization

Longitudinal Wave Transverse Wave

`

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Wavefront Representation

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Wavefront RepresentationHow long is the marked

distance?a) /2b) c) T/2d) T

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Source vs. Medium Consider:

Period Wavelength Frequency Wave speed

Which can be changed if the source changes in some way?

Which can be changed if the medium changes in some way?

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Source vs. Medium

When I change the speed at which the machine moves, which of the following will change?

a) Frequency, period, wavelength, and wave speed all change

b) Frequency, period and wavelength

c) Frequency and wavelength

d) Wavelength and wave speed

e) Frequency and period

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Waves review Wave displacement

depends on where AND when (x and t)!

What are we graphing anyway?

Check out “longitudinal traveling wave” application; Link on web page!

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Total Phase

Which of the following includes only points with a total phase of exactly /2?

a) All

b) ABC

c) ADG

d) AEH

e) ACF

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Total Phase

Which of the following includes only points with a total phase equivalent to /2?

a) All

b) ABC

c) ADG

d) AEH

e) ACF

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Fixed Phase Constant

Which of the following lists only points with a fixed phase constant of exactly to /2?

a) All

b) ABC

c) ADG

d) AEH

e) ACF

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Mathematical relationships & Model Tools: Making sense of the wave equation:

Using Total Phase Charts:

2π 2π Unit circle

Wave 1

€

t

T

€

x

λ

€

=Asin(Φ)

€

y(x,t) = Asin(2πt

T± 2π

x

λ+ φ)

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Practice Quiz