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All matter is made up of atoms. The structural arrangement and behaviour of the atoms explain the properties of different materials. The big idea is developed through a series of key concepts at age 11-14. This topic develops the following key concepts: • CPS1.1: Particle model for the solid, liquid and gas states.
19 Ιαν 2023 · One of the first experiments which is exhibited strong experimental evidence of light behaving like a particle was the photoelectric effect, which first led Albert Einstein to develop the particle model of light. In the photoelectric effect, a beam of incoming light shines on a metallic surface.
Explore and interpret representations of particles, including three-dimensional models, using this lesson plan with activities for 11–14 year olds.
Summarize the early evidence for Newton’s particle model of light. Include: propagation, reflection, refraction, dispersion. Experiment to show the particle model of light predicts that the velocity of light in a refractive medium is greater than the velocity of light in an incident medium (vr > vi).
Students investigate using the box model, readings, videos, and data collected with light sensors to develop a robust model and explanation for how light interacts with an object’s material. This unit does not address absorption of light, which is taken up in the Cup Design Unit .
particle model. For example it was known that when light reflects from a smooth surface, the angle of incidence is equal to the angle of reflection. This is also how an elastic, frictionless ball bounces from a smooth surface. As we shall see, a key property for the particle theory is refraction.
This resource features three different versions of a worksheet on the particle model: scaffolded, partially scaffolded and unscaffolded. Use the worksheets to identify learners’ knowledge gaps and misconceptions after teaching or before revisiting these topics.
