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Lesson: Infrared Radiation Physics

In this lesson, we will learn how to describe how the temperature of an object and its surface features affect the object’s emission and absorption of infrared radiation.

Lesson Plan

Students will be able to

identify how the color of a surface affects its emission and absorption of infrared radiation,
identify how the reflectivity of a surface affects its emission and absorption of infrared radiation,
recognize that the output of infrared radiation increases with the temperature of an object and vice versa,
describe the shape of the spectrum of light radiated by objects of different temperatures.

Lesson Presentation

Lesson Video

Lesson Explainer

Lesson Worksheet

Q1:

Which color of a surface makes it better at emitting and absorbing infrared radiation, black or white?

Q2:

Which emits and absorbs infrared radiation more easily, a strongly reflective or a weakly reflective surface?

Q3:

A plastic block is placed in constant-intensity sunlight and absorbs infrared radiation. During the block’s exposure to sunlight, its temperature decreases. Which of the following statements is correct?