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Physics 7C SS1 Lecture 2: Waves
Total Phase… and Implications for Interference
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Agenda Get clickers working Review Simple Harmonic Wave model
Introduce total phase Phase chart representation Graphing practice (briefly) Introduce interference (briefly) A common wave: sound Wavefront representation
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Longitudinal vs. Transverse Wave Polarization
` Longitudinal Wave Transverse Wave
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Clicker Setup: Joining Class
Turn on your clicker; It scans for Classes If it doesn’t scan automatically, hit enter (green button) Find SS1PHY7C; hit enter Display reads “ANS: SS1PHY7C;” hit enter When you’ve successfully joined, display reads “ANS: wait for Q”
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PRS Clicker Setup: Student ID
Turn on your clicker Press * to access Setup Menu Scroll to find “ID;” hit Enter (green button) Enter your Student ID so I can give you credit; hit enter
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Check Clicker Setup In DL on Tuesday and Wednesday we talked about…
A) Three-phase diagrams and the heat pack B) Connections between angular and linear variables, such as torque and force C) Waves and Oscillators D) Steady-state fluid flow E) Slow down--I didn’t get my ID entered yet!
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Source vs. Medium Frequency depends on… A) Source B) Medium C) Neither
D) Both
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Source vs. Medium Wave Speed depends on… A) Source B) Medium
C) Neither D) Both
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Source vs. Medium Period depends on… A) Source B) Medium C) Neither
D) Both
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Source vs. Medium Wavelength depends on… A) Source B) Medium
C) Neither D) Both
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Applying the concepts: Transmission to 2nd Machine
When the wave travels from one machine to the next, which parameters 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) Only wave speed
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Applying the concepts: Transmission to 2nd Machine
When the wave travels from one machine to the next, which parameters 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) Only wave speed
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The Total Phase Making sense of the wave equation:
Using Total Phase Charts: 2π 2π Unit circle Wave 1
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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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The Total Phase Making sense of the wave equation:
Using Total Phase Charts: 2π 2π Unit circle Wave 1
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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
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Interfering Sound Waves
What type of interference would result? Constructive Destructive Partial No interference
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Interfering Sound Waves
+ Greater pressure fluctuations More & less intense means louder and softer Greater amplitude
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Interfering Sound Waves
+ Greater pressure fluctuations More & less intense means louder and softer Amplitude is zero
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A vibrating object acts as the source of the wave
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 = f (note meters per second)
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Wavefront Representation
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Wavefront Representation
How long is the marked distance? /2 T/2 T
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