# Lesson Order

• 4-WAV-01a Wave Types and Basic Characteristics
• 4-WAV-02a Reflection and Refraction
• 4-WAV-02b Reflection and Refraction (and Diffraction (Single Award Only))
• 4-WAV-03a Sound Waves and Hearing
• 4-WAV-03b Sound Waves and Hearing (and Oscilloscopes (Single Award Only))
• 4-WAV-04a The Electromagnetic Spectrum
• 4-WAV-Test Revision and Test

Most lessons are common to single and dual award. Only weeks 2 and 3 have additional material for separate award to cover. This means that separate award will have more time in weeks 1, 4, 5 and 6 to reinforce more.

# Suggested lessons

Week 1 Double lesson (SS and DA)

• Pupils understand and can use the terms amplitude, frequency, wavelength and period.
• Pupils can describe the differences between longitudinal and transverse waves and give examples of each.
• Pupils recall that waves transfer energy without transferring matter.
• Pupils can use the wave equation

Week 2 Double lesson (SS and DA)

• Pupils can state and use the Law of Reflection. Simple reflection experiment.
• Pupils can explain refraction as due to a change of speed in different media.
• Pupils can predict the change in direction of a wave due to refraction, including examples using light (including dispersion) and in water, using wave front to explain what is occurring.

Week 2 Single lesson (SS)

• Pupils can explain diffraction as the spreading of a wave around an object.
• Pupils can sketch different diffraction effects where λ << a; λ = a; λ >> a

Week 3 Double lesson (SS and DA)'

• Pupils can recall the hearing range of a human and determine whether a frequency lies within the range.
• Pupils understand that any sound wave with a frequency greater than 20kHz is known as ultrasound.
• Pupils can recall different uses of ultrasound and can explain the idea of ultrasound scanning using an echo.
• Pupils can describe how to measure the speed of sound using a clapping method and an electronic method.

Week 3 Single lesson (SS)

• Pupils understand how an oscilloscope and microphone can be used to display a sound wave.
• Pupils can read an oscilloscope trace to determine the time period and frequency of a sound wave.
• Pupils understand how the volume and pitch affect the amplitude and frequency of a sound wave.

# Topics Covered

• Longitudinal and transverse waves
• The electromagnetic spectrum
• Sound waves and hearing