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# Quiz 1 - PowerPoint PPT Presentation

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 SS1Lecture 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
• Causes of interference types
The Total Phase
• Making sense of the wave equation:
• Using Total Phase Charts:
Total Phase
• Which of the following includes only points with a total phase of exactly/2?

A) All

B) ABC

D) AEH

E) ACF

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

A) All

B) ABC

D) AEH

E) ACF

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 Phase
• Making sense of the wave equation:
• Using Total Phase Charts:
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

What type of interference would result?

Constructive

Destructive

Partial

No interference

Interfering Sound Waves

+

Greater pressure fluctuations

More & less intense means louder and softer

Greater amplitude

Interfering Sound Waves

+

Greater pressure fluctuations

More & less intense means louder and softer

Amplitude is zero

Phase Chart for Interfering Waves
• Same rough format, but add difference (most important part!)
What factors might influence type of interference?

Anything that helps determine total phase!!!

x=0

x=/2

x



None of the above

x=0

x=/2

x



None of the above

(and other terms like =0)

Interference for differing frequencies: Beats.

1

2

3

4

5

What type of interference occurs at each point?

Wavefront Representation

How long is the marked distance?

/2

T/2

T