Lecture 13 - Reflection of Light (Ch. 25.1-25.3)

# Lecture 13 - Reflection of Light (Ch. 25.1-25.3) - Lecture...

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Lecture 13 Short Review + Start of Ch 25

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Midterm Friday: 7 Multiple Choice 2 Short Answer 2 Long Answer Approved Calculators Eqt. Sheet provided Through Ch. 24 + 25.2 (today’s lecture)
Hooke’s Law and Springs o According to Hooke’s Law , an ideal spring exerts a force proportional to the amount it is pushed or stretched, but always in the opposite direction: Hooke s Law: F = k x Note this is a vector equation k is called the spring constant (in N/m) For a given spring, it is always the same Equilibrium Remember that a block on a spring oscillates in time like a cosine wave because springs pull and push against displacement as: F=-kx

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Another example of Simple Harmonic Oscillation: The Simple Pendulum Force diagram: in the direction of “S” in the figure: Gravity along s direction: In the case that the oscillation angle is small then the equation of motion becomes very familiar:
Sinusoidal Waves Each point experiences Simple Harmonic Motion (up and down). The wave travels to the right at speed

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Transverse Velocity and Acceleration o The general solution for a sinusoidal wave allows us to calculate the transverse (up and down) velocity and acceleration at any point and time:
What sets the wave speed?

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Tension and Wave Speed o Speed of a transverse wave on a string: T v μ = Higher tension, higher speed Heavier string, slower speed
Sound Waves: Moving source or observer The Doppler Effect o When a source is moving relative to the medium of sound there is a shift in frequency (the Doppler Effect) Actually, applies to all waves, including light o If both source and observer are moving: o Here v is the speed of sound in the medium (might not be air!).

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