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Lesson: The Quantization of Electromagnetic Radiation Physics

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In this lesson, we will learn how to calculate the energy of a photon given its frequency or wavelength.

Lesson Plan

Students will be able to

recognize that light consists of photons,
recognize that the energy of a photon is proportional to its frequency,
recognize that the energy of a photon is inversely proportional to its wavelength,
use the formula ,
use the formula ,
find the total energy of identical photons given the frequency or wavelength of each photon.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Playlist

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Lesson Worksheet

Q1:

A laser emits photons, each with a frequency of Hz. What is the total energy radiated by the laser? Use a value of J⋅s for the Planck constant. Give your answer to the nearest joule.

Q2:

What is the energy of a photon that has a wavelength of 400 nm? Use J⋅s for the value of the Planck constant and m/s for the value of the speed of light in free space. Give your answer in scientific notation to two decimal places.

Q3:

What is the frequency of a photon that has an energy of J? Use a value of J⋅s for the Planck constant. Give your answer in scientific notation to two decimal places.