Oklahoma Science PH.PS4.3
The Standard
Develop an argument for how scientific evidence supports the explanation that electromagnetic radiation can be described either by the wave model or the particle model, and in some situations one model is more useful than the other.
Oklahoma Academic Standards for Science (2026)
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students use diffraction patterns and electron emission results as evidence for two models of light. They choose the model that best explains each result and say why.
What Mastery Looks Like
- A student uses bright and dark bands from a grating to support the wave model. They explain why dim blue light can release electrons from a metal when bright red light cannot, using photon energy and the metal's frequency cutoff.
Common Misconceptions
- Students may think light switches between being a wave and being a particle. They may think making red light brighter lets it release electrons even when its frequency is below the cutoff. Some think diffraction rules out the particle model entirely.
How to Assess It
- Exit ticket: A grating makes bright and dark bands. A metal releases electrons under dim blue light but not bright red light. Which model better explains each result, and what evidence supports each choice?
Lesson moves
Ways to Teach It
Have students view a flashlight through a diffraction grating and sketch the colored bands beside the white image.
Ask why dim blue light releases electrons from a metal with a cutoff between red and blue, while bright red light does not.
Give pairs three cards: grating bands, double-slit stripes, and electron emission above a frequency cutoff. Have them sort by useful model and explain.
Give students a solar cell card with a 1.5 eV cutoff. Ask whether 2 eV or 1 eV photons can generate current.
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Printable PH.PS4.3 Worksheet
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Related Standards
- AR.PS4.3
Develop an argument for how scientific evidence supports the explanation that electromagnetic radiation can be described either by a wave model or the particle ...
- CH.PS4.3
Develop an argument for how scientific evidence supports the explanation that electromagnetic radiation can be described either by the wave model or the particl...
- PH.PS3.2
Develop and use models to illustrate that energy at the macroscopic scale can be accounted for as either motions of particles or energy stored in fields.
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