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Quiz 1. Physics 7C SS1 Lecture 2: Wave Model. Total Phase… and Implications for Interference. Agenda. Review Simple Harmonic Wave model Graphing practice (briefly) Introduce total phase Phase chart representation Introduce interference Phase chart representation

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Physics 7c ss1 lecture 2 wave model

Physics 7C SS1Lecture 2: Wave Model

Total Phase…

and Implications for Interference


Agenda
Agenda

  • Review Simple Harmonic Wave model

    • Graphing practice (briefly)

  • Introduce total phase

    • Phase chart representation

  • Introduce interference

    • Phase chart representation

    • Causes of interference types


The total phase
The Total Phase

  • Making sense of the wave equation:

  • Using Total Phase Charts:


Total phase
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


Total phase1
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


Fixed phase constant
Fixed Phase Constant

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

    A) All (The wave paramaters apply at all peaks. They share the same amplitude, equilibrium, wavelength, period, and fixed phase constant)

    B) ABC (These were all at t=0 s for different positions)

    C) ADG (These were all at x=0 m for different times)

    D) AEH (These were all at peaks--quite likely the same peak that had traveled, and thus =/2)

    E) ACF (These were all at peaks, though at least A and C were different peaks.  at each is equivalent to /2)


The total phase1
The Total Phase

  • Making sense of the wave equation:

  • Using Total Phase Charts:


Interference when waves meet
Interference: When Waves Meet

  • Phenomena:

    • Interfering pulses on the wave machine

    • Interfering block-wave

  • Using Total Phase

    • Equivalent total phase: Constructive

    • Total phase separated by half-cycle: Destructive


A vibrating object acts as the source of the wave. As a speaker moves through a cycle, it fixes the period and frequency.

  • A = Amplitude, controlled by what starts the wave

  • T = Period, how long to get back to where it started

     = Wavelength, repeat distance in space

    T = where f is the frequency

    Velocity v = 


Interfering sound waves
Interfering Sound Waves speaker moves through a cycle, it fixes the period and frequency.

What type of interference would result?

Constructive

Destructive

Partial

No interference


Interfering sound waves1
Interfering Sound Waves speaker moves through a cycle, it fixes the period and frequency.

+

Greater pressure fluctuations

More & less intense means louder and softer

Greater amplitude


Interfering sound waves2
Interfering Sound Waves speaker moves through a cycle, it fixes the period and frequency.

+

Greater pressure fluctuations

More & less intense means louder and softer

Amplitude is zero


Phase chart for interfering waves
Phase Chart for Interfering Waves speaker moves through a cycle, it fixes the period and frequency.

  • Same rough format, but add difference (most important part!)


What factors might influence type of interference
What factors might influence type of interference? speaker moves through a cycle, it fixes the period and frequency.

Anything that helps determine total phase!!!


What is responsible for the destructive interference in this case
What is responsible for the destructive interference in this case?

x=0

x=/2

x



None of the above


What is responsible for the destructive interference in this case1
What is responsible for the destructive interference in this case?

x=0

x=/2

x



None of the above

(and other terms like =0)


Interference for differing frequencies beats
Interference for differing frequencies: Beats. case?

1

2

3

4

5

What type of interference occurs at each point?



Wavefront representation1
Wavefront Representation case?

How long is the marked distance?

/2

T/2

T


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