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Objective: To identify whether positive, negative, or zero work is being done, to identify the force that is doing the work, and to describe the energy transformation associated with such work.

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Models of Light

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Analyze the reflection of light from the perspective of both the wave model and the particle model.

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Analyze the interference of light from the perspective of both the wave model and the particle model.

An NGSS-inspired activity on the wave and particle models of light.

Summarize the evidence that supports the wave model and the particle model of light.

Analyze the photoelectric effect from the perspective of both the wave model and the particle model.

Light Interference

Analyze the diffraction of light from the perspective of both the wave model and the particle model.

Light Reflection

Evaluating Claims

The Photoelectric Effect

Diffraction

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Activity 2: Diffraction The left figure shows that, when water waves strike a barrier, they bend into the shadow region. This phenomenon is called diffraction. The right figure shows that, when rolling marbles strike a barrier, no marbles bend into the shadow region but instead continue to move in a straight line.

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Physics-Interactives/Static-Electricity/

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3,3,3,3,3,3,1,1,1,1,6,2,2,2,2,2,6

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Reflection,Diffraction,Interference,Photoelectric Effect,Evaluating Claims

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Activity 4: Photoelectric Effect A famous experiment that scientists have performed is called the photoelectric effect. In this experiment, under certain conditions light can ‘kick out’ (or emit) electrons from a piece of metal. The left figure shows the results of an investigation where the intensity (brightness) of the light was changed. The right figure shows the results of an investigation where the color of light was changed. The bottom table shows the property of light that is associated with increased energy in each model.

Activity 1: Reflection Scientists have long asked the question, “What is light?” Throughout history, two models have been explored: Throughout this activity, we’ll use water waves to represent the wave model and marbles to represent the particle model.

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Activity 3: Interference The left figure shows how water waves diffract as they pass through two slits. These curved waves then interfere with each other to make places of constructive and destructive interference. The middle figure shows that when moving marbles encounter a wall with two openings, the marbles aligned with the slits go through in a straight line. The right figure shows how when laser light shines through two very tiny slits that are very close together, a pattern of bright and dark spots appears on a distant screen.

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