Term 2 Week 5 2017

Homework

• Ex 5A, p. 151-155, Models of the Atom
• Ex 5B, p. 160-171, Radioactivity

Half-Life Exponential Formula

Half-Life Example Calculation

Half-Life Calculations: Radioactive Decay

Term 2 Week 4 2017

Homework

• Ex 5A, p. 151-155, Models of the Atom
• Ex 5B, p. 160-171, Radioactivity

History of the Atom

Models of the Atom

Thomson's Plum Pudding Model

Rutherford's Gold Foil Experiment

Parts of the Atom

Isotopes

Isotopes are versions of an atom or an element that have the same number of protons, but different numbers of neutrons

What are Isotopes?

Radioactive Decay

Alpha, Beta & Gamma Radiation

• Alpha particles are emitted by a larger nucleus that has too many Protons
• Beta particles are emitted by a nucleus that has too many Neutrons
• Gamma photons are emitted by a nucleus that has too much Energy (is in an exited state)

• PhET Alpha Decay app can be found here
• PhET Beta Decay app can be found here

Alpha Decay

Beta Decay

Radiation

Types of Radiation

Is radiation dangerous?

The Most Radioactive Places on Earth

Millisieverts and Radiation - Sixty Symbols

Half Life

Nuclear Half Life: Intro and Explanation

Nuclear Half Life: Calculations

Term 2 Week 3 2017

Homework

• Ex 3D, p.66--67, Wave Properties
• Ex 3E, p.69-70, Diffration
• Ex 3F, p.73-75 Superposition
• Ex 3G, p.76-78, Two Point Source Interference
• Ex 3H, p.81-81, Reflection

Reflection on A String

Hard Boundary

Wave reflects on opposite side (opposite phase)

Reflection on A String

Soft Boundary

Wave reflects on same side (same phase)

Refraction on A String

Fast to Slow Boundary

Relation of waves to Incident Wave

Reflected Wave - same speed - same wavelength - opposite phase

Refracted Wave - slower speed - smaller wavelength - same phase

Refraction on A String

Slow to Fast Boundary

Relation of waves to Incident Wave

Reflected Wave - same speed - same wavelength - same phase

Refracted Wave - faster speed - larger wavelength - same phase

Diffraction

The Bending of Waves Around Corners

• Larger Wavelength - greater the angle of diffraction
• Shorter Wavelength - smaller the angle of diffraction
• Also the smaller the gap the greater the angle of diffraction

Diffraction of Water Waves in a Ripple Tank

Two Point Source Interference

PhET Wave Interference App

Term 2 Week 2 2017

Homework

• Ex 3D, p.66--67, Wave Properties
• Ex 3E, p.69-70, Diffration
• Ex 3F, p.3F, p.73-75 Superposition

Basic Properties of Waves

waves transfer energy through a medium without transferring the medium itself

• Cycle - a basic repeating unit in a wave
• Amplitude A (m) - the distance from the middle point to the top of a crest, or bottom of a trough
• Wavelength 𝜆 (m) - the distance/length of one cycle
• Period T (s = s per cycle) - the time it takes for one cycle to pass a point
• Frequency f (Hz = cycles per second) - the number of cycles that pass in one second

T = 1/f & f = 1/T

• Wave Speed v (ms-1) the speed of a wave

v = 𝜆/T & v = f𝜆

Wave Properties

Pendulum Waves

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

• Superposition of Waves: two waves traveling through each other will not change each other motion in any way, but they will add to one another when they overlap
• Constructive Interference - Reinforcement - In Phase
• Deconstructive Interference - Cancellation - Out of Phase

Term 2 Week 1 2017

Homework:
Ex 4G, p.125-130, Forces and rotational motion

Torque (Moments anout a point)
Static (unmoving) systems will be used for this section. Therefore all forces, linear and turning, are balanced

Torque

PhET Torque Balancing Act link here

Term 1 Week 11 2017

Lab Assessment Phy 2.1 AS 91168
Six periods are allowed for this assessment. This year the option of doing the assessment using google docs and sheets through Hapara will be trialed

Term 1 Week 10 2017

Lab Assessment Phy 2.1 AS 91168
Six periods are allowed for this assessment. This year the option of doing the assessment using google docs and sheets through Hapara will be trialed