Learning Exercise

Electromagnetic Spectrum

This lesson will introduce the Electromagnetic Spectrum and all the types of radiation that make up the spectrum. It will include not only an introduction to waves and frequency, but how each type of radiation can be used.
Course: Life Science - 7th

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1) Last time, we discussed radiation as particles that are emitted from unstable atoms. The Sun gives off radiation, as well, and it comes in different forms depending on how fast it moves. 2) Slinkies will be handed out to each group of students and the students will practice moving the slinkies across the tables and make what's known as a standing wave (which will be drawn on the board). 3) Students will be asked about the shape of the wave and what happens when they speed up and slow down the movements of the slinky. 4) After the slinky activity, the students will take notes on the different parts of a wave - crest, trough, wavelength, frequency. 5) High frequency will be described as having a lot of energy and low frequency will be described as having a lower amount of energy. 6) A poster or website picture showing the different radiation in the electromagnetic spectrum will be shown. Radio waves have the lowest frequency and have the least amount of radiation. They are used for transmitting radio and television signals. Each type of radiation will be described, moving up in frequency. (Microwaves, Infrared, Visible Light, Ultraviolet, X-Rays, and Gamma Rays). As each is described, one or two uses for them will also be noted. 7) Students will be given vocabulary graphic organizers for classwork/homework where they will define four of the types of radiation (focus on infrared, visible light, ultraviolet, and electromagnetic spectrum as a whole), draw a picture related to the word, describe what the word is NOT, use the word in their own sentence, and give some examples of the word. The students may use their book to help them. 8) If they finish in time, they may turn it in, if not it is for homework.


Electromagnetic Spectrum

Learning Objectives

Students will understand the different types of radiation that come from the Sun and stars in the universe and something about each of the types of radiation. Students will learn about waves and the difference between low frequency waves and high frequency waves and how they affect our lives.