Edexcel International GCSE Physics3d Light and sound Checklist

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What's on this checklist

Papers 1 and 2

I know that light waves are transverse waves and that they can be reflected and refracted.
I can use the law of reflection (the angle of incidence equals the angle of reflection).
I can draw ray diagrams to show reflection and refraction.
Practical: I can investigate the refraction of light, using rectangular blocks, semi-circular blocks and triangular prisms.
I know and can use the relationship between refractive index, angle of incidence and angle of refraction: n = sin i / sin r
Practical: I can investigate the refractive index of glass, using a glass block.
I can describe how total internal reflection is used to transmit information along optical fibres, and its role in prisms.
I can explain what is meant by the critical angle, c.
I know and can use the relationship between critical angle and refractive index: sin c = 1 / n
I know that sound waves are longitudinal waves, and that they can be reflected and refracted.

I know that the frequency range of human hearing is 20–20 000 Hz.
Practical: I can investigate the speed of sound in air.
I understand how an oscilloscope and a microphone can be used to display a sound wave.
Practical: I can investigate the frequency of a sound wave using an oscilloscope.
I understand how the pitch of a sound is related to the frequency of vibration of its source.
I understand how the loudness of a sound is related to the amplitude of vibration of its source.