Term 3 Week 3 2018

Homework

Ex 3D, p.75-79, Standing Waves and Music

Ex 3E, p.81-84, Beats

Ex 3F, p. 87-96 Doppler Effect

Ex 3B, p. 57-62, Two Point Source Interference (Double Slit Experiment)

Beats

two waves of a similar frequency (similar wavelength) superimpose to come in and out of phase causing constructive and deconstructive interference respectively. This causes a warbling/beat sound of frequency (fb) equal to the difference in respective frequencies

fb = | f1 - f2 |

Wave Beats

Easy Beats- Physics

Doppler Effect

The Doppler Effect: what does motion do to waves?

Doppler Effect

Intro to the Doppler Effect

Doppler Effect Observed Frequency Equation

Sonic Boom

Two Point Source Interference

• Antinodes - Path Difference = n𝜆
• Nodes - Path Difference = (n + 1/2)𝜆

Two Point Source Interference

n𝜆 = dsin(𝛳)

n: Antinodal Fringe Number

𝜆: Wavelength (m)

d: Slit-Spacing (m)

𝛳: Angle between Fringe on screen from the central position line

Iff 𝛳 is very small, then

n𝜆 = dx/L

x: Distance from Fringe on screen to central position (m)

L: Distance from slits to screen along the central position line (m)

Wave-Particle Duality Applied to the Double Slit Experiment