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Physics 9: Revision

Revision

Info

The semester exam will be a cumulative exam of all four units: Waves, Energy, States of matter & Radioactivity. The main focus will be on Waves and Radioactivity. 

Notice! The first question on the exam will ask you to state the units and symbols for different quantities.

E.g.

frequency f hertz Hz
 

Topics for the semester exam:

WAVES
- amplitude, frequency, period, wavelength 
- using the wave equation 
- transverse and longitudinal waves 
- wave phenomena (refraction, reflection and diffraction. NO INTERFERENCE, NO STANDING WAVES) 
- using Snell's law 
- the electromagnetic spectrum (you need to know the two extremes. DO NOT MEMORISE THE FREQUENCIES OR WAVELENGTHS) 
- uses of waves 
- sound waves (loudness and pitch)

NOTE! LENSES AND MIRRORS WILL NOT BE ON THE EXAM!

ENERGY

- basics of power stations & focus on hydroelectric plants
- different forms of energy 
- energy transformations 
- calculations involving efficiency 

STATES OF MATTER
- density (you must be able to find and compare the density even if the units are different. E.g Object 1: m=2kg, V=3.5cm^3, Object 2: m=350g, V=440mm^3. Which is denser?)
- heat transfer (conduction, convection and radiation) 
- absorption and emission of heat (depending on surface colour) 
- the three states of matter 
- the kinetic molecular model (how the different states are explained by looking at the small molecules) 
- heat and temperature (what is the difference and how does temperature relate to the kinetic energy of the particles?)
- different temperature scales (What are they?

RADIOACTIVITY
- knowing the three different kinds of radiation and their properties (alfa, beta and gamma) 
- decay equations 
- uses of radiation (thickness control, tracers and sterilising
half-life calculations and graphs