Achievement Criteria
Describe/Explain/Discuss selected properties and applications of EMR, radioactive decay, sound and ultrasound.

Notes:.
Properties
will be selected from
· for EMR: wave propagation, wave type, wavelength, frequency, period, wave velocity, amplitude, two point source interference, reflection, refraction, diffraction, EMR spectrum, absorption
· for radioactive decay: alpha and beta particles, gamma rays, conservation of atomic and mass number in alpha, beta and gamma decay, half life, isotopes, ionisation, penetration
· for sound and ultrasound: wave propagation, wave type, wavelength, frequency, period, wave velocity in different media, amplitude, pitch, loudness, reflection, diffraction, transmission, absorption.

Applications will be limited to the aspects of the application, which relate to the properties in Explanatory Note 2. Examples of applications could include:
· for EMR: shadows and eclipses; radio wave transmission; radio receivers; microwave oven; optical, radio and infrared telescopes; photographic imaging in different parts of the spectrum; medical diagnosis and treatment; radar; speed guns
· for radioactive decay: Geiger counters, radiometric dating, irradiation of food, sterilisation, medical diagnosis and treatment, smoke detectors, density and thickness measurements
· for sound and ultrasound: acoustics, ultrasound scanning, Doppler effect, animal communication.

Terms
· Describe requires the student to recognise, name, draw, give characteristics of or an account of.
· Explain requires the student to provide a reason as to how or why something occurs.
· Discuss requires the student to show understanding by linking scientific ideas. It may involve students in justifying, relating, evaluating, comparing and contrasting, analysing.
The description, explanation and discussion of properties and applications of the phenomena will also involve solving problems using formulae, graphs or diagrams.
Formula anr graphs:
Recall and use of the following formulae is expected:
c = f
l, v = fl, v = d/t , f = 1 / T
If other formulae are required, they will be provided.
Use of graphs or diagrams could include reading information directly from graphs (including interpolation and extrapolation), drawing graphs from given information, or extracting information from a diagram.
Standard form, correct units and sensible rounding is expected in solving problems.

Past Papers:
2007: Exam paper answers
2006: Exam paper answers
2005: Exam paper answers
2004: Exam paper answers