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Lesson: Spontaneous and Stimulated Emission Physics

In this lesson, we will learn how to describe the processes of spontaneous emission of light and stimulated emission of light.

Lesson Plan

Students will be able to

define the excited and relaxed states of a bound electron,
describe the interactions that occur between photons and electrons during spontaneous emission,
describe the interactions that occur between photons and electrons during stimulated emission,
recall that the phase and direction of a photon produced by stimulated emission are the same as the phase and direction of the photon that induced the emission.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Playlist

05:12
04:01
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02:43

Lesson Worksheet

Q1:

Which of the following is the closest value to the approximate typical lifetime of an excited electron in an atom?

Q2:

The diagram shows the ground state and the excited state of an electron in an atom that is in the path of a stream of photons. Which of the following diagrams most correctly represents the stimulated emission of a photon from the atom due to a change in the energy level of the electron?

Q3:

At an instant , a hydrogen atom has just absorbed a photon, increasing the energy of its electron to . A time interval then elapses, during which no other photons interact with the atom.

How does , the energy of the electron at a time after , compare to ?

Will any photons have been emitted at a time after ?

Which of the following is the term used for the state of the electron at a time after ?