Is light a particle or a wave?

Who were the first to think (more or less scientifically) about what light is?

• Greeks

• Romans

• Native Americans

• Chinese

Who hypothesized that light was not perceived by tiny probes released from the eyes, but rather by sensing the light emitted by objects outside of the body?

• Aristotle

• Plato

• Alhazen

• Aristophanes

Colm says, "Even geniuses sometimes get things wrong." What other major scientific principles did scientists get wrong for centuries and centuries? When were these principles correctly proven?

All objects emit their own light.

• True

• False

Is light a particle or a wave?

• Particle

• Wave

• Neither

• Both

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What are interference patterns?

• A complicated football strategy

• A popular print from which you can make dresses

• The complicated undulations that happen when two wave patterns occupy the same space

• The complicated undulations that happens when two wave patterns do not occupy the same space

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Draw a diagram showing why, when two beams of light cross paths, they do not interact or crash together at all. Try with two laser beams and chalk dust.

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Explain why light is both a wave and a particle. Give one example why is behaves like a wave and then why it behaves like a particle.

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