Term 2 Week 9 2018

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

Frequency & Period

Wave Phase

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 8 2018

Homework

• Ex 5A, p. 151-155, Models of the Atom
• Ex 5B, p. 160-171, Radioactivity
• Ex 5C, p. 175-182, Nuclear Reactions

Revision for the Atomic & Nuclear Assessment next week

Atomic and Nuclear Pre-Aligned Exams AS 90253

(Scroll to the bottom of this page - link)

The pre-aligned Standard Covering:

1. Historical models of the Atom;
2. Half-Life;
3. but not Nuclear Reactions

Term 2 Week 7 2018

Homework

• Ex 5A, p. 151-155, Models of the Atom
• Ex 5B, p. 160-171, Radioactivity
• Ex 5C, p. 175-182, Nuclear Reactions

Nuclear Reactions:

• Conservation of Atomic Number
• Conservation of Nucleon Number
• Conservation of Mass-Energy E = Δmc2

E = Δmc2

Nuclear Fusion in the Sun

Binding Energy comes from the change in mass from individual nucleons to being combined into a nucleus. This is energy lost by the nucleons joined together in a nucleus and must be returned in order to separate the nucleons

E = Δmc2

Mass Energy Equivalence

Nuclear Reactions

Fission Fusion and Radioactive Decay

Fission & Fusion

Term 2 Week 6 2018

Homework:

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

Rutherford'd Den and Canterbury University Field Trip

Term 2 Week 5 2018

Homework:

• Ex 4G, p. 125-130, Torque, Static Moments
• Ex 5A, p.151-155, Models of the Atom
• Ex 5B, p. 160-171, Half-Life

Alpha, Beta, Gamma Ionising Radiation

• Ionising Radiation is radiation that will give a charge to matter. This includes EM radiation (photons) that have enough energy to ionise - e.g. X-Rays and 𝜸 - Rays. This also includes charged particles such as α and 𝞫 particles.

Ionising Radiation

Types of Radiation Alpha, Beta, Gamma

Radiation vs Radioactive Atoms

Is Radiation Dangerous?

Radioactivity: Expect the unexpected

EM Spectrum

Term 2 Week 5 2018

Homework:

• Ex 4G, p. 125-130, Torque, Static Moments
• Ex 5A, p.151-155, Models of the Atom

Models of the Atom

Models of the Atom Timeline

Discovery of the Electron: Cathode Ray Tube Experiment

Discovery of the Nucleus: Rutherford's Gold Foil Experiment

Charge of an Electron: Millikan's Oil Drop Experiment

Atomic Structure: Discovery of the Neutron

Term 2 Week 3 2018

Homework:

• Ex 4J, p. 143-147 Energy, Work, Power
• Ex 4I, p.137-141, Springs
• Ex 4G, p. 125-130, Torque, Static Moments

Torque

𝝉 = F L⦜

𝝉: Torque (Nm)

F: applied Force (N)

L⦜: Length of lever at right angles to the applied force (m)

• Torque (Moments) in Level 2 Physics will involve Static Systems
• Therefore the Torques are balanced and the Forces are balanced - Newton's Laws of Motion apply to turning forces as well as linear forces
• PhET - Torque Balancing Act simulation

Bridge support forces moments