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

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

This preview shows pages 1–10. Sign up to view the full content.

Lecture 13 Short Review + Start of Ch 25

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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!). o

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 09/08/2008 for the course PHYS 3B taught by Professor Wu during the Spring '08 term at UC Irvine.

### Page1 / 33

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

This preview shows document pages 1 - 10. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online