Sunday, 5 August 2018

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

Sunday, 29 July 2018

Term 3 Week 2 2018

Homework

Ex 4H, p. 160-162, Rotational Motion

Ex 4I, p167-171, Angular Momentum

Ex 4J, p. 175-177, Rotational Kinetic Energy

Ex 4K, p.184-187, SHM (Simple Harmonic Motion)

Ex 4L, p.191-194, SHM and the Reference Circle

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

Longitudinal Waves

Particle displacement in the medium is parallel to the direction of wave propagation e.g. sound waves, primary earthquake waves

Transverse Waves

Particle displacement in the medium is perpendicular to the direction of wave propagation e.g. light and other electromagnetic waves, secondary earthquake waves

Frequency - Period

Sound Waves

Superposition of Waves

Waves travel through each other and the total amplitude at any moment is equal to the sum of amplitudes of the individual waves.

Standing Waves

In musical instruments - when a reflected wave travels back through itself causing fixed points of Nodes (Deconstructive Interference) and Antinodes (Constructive Interference) due to the fractional relationship between the wavelength (𝜆) of the wave and the length (L) of the resonating chamber

in musical instruments - when a reflected wave travels back through itself causing fixed points of Nodes (Deconstructive Interference) and Antinodes (Constructive Interference) due to the fractional relationship between the wavelength (𝜆) of the wave and the length (L) of the resonating chamber

Harmonic	String	Double Open Ended Pipe	Closed Ended Pipe
1st	𝜆 = 2L f = f1st	𝜆 = 2L f = f1st	𝜆 = 4L f = f1st
2nd	𝜆 = L f = 2f1st	𝜆 = L f = 2f1st
3rd	𝜆 = ⅔ L f = 3f1st	𝜆 = ⅔ L f = 3f1st	𝜆 = 4/3 L f = 3f1st
4th	𝜆 = ½ L f = 4f1st	𝜆 = ½ L f = 4f1st
5th	𝜆 = ⅖ L f = 5f1st	𝜆 = ⅖ L f = 5f1st	𝜆 = ⅘ L f = 5f1st