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Light Waves and Matter Read from Lesson 2 of the Light Waves and Color chapter at The Physics Classroom: http://www.physicsclassroom.com/Class/light/u1212a.html MOP Connection: Light and Color: sublevel 1 1. Alight wave is an electromagnetic wave which has both an electric and magnetic component associated with it. Electromagnetic waves are often distinguished from mechanical waves. The distinction is based on the fact that electromagnetic waves a. can travel through materials and mechanical waves cannot ome in a range of frequencies and mechanical waves exist with only certain frequencies @‘m travel through a region void of matter and mechanical waves cannot ~ electromagnetic waves cannot transport energy and mechanical waves can transport energy e. electromagnetic waves have an infinite speed and mechanical waves have a finite speed 2. Consider the diagram below. It represents the beginnings of an electromagnetic spectrum below. Complete the diagram by labeling the following regions: ultraviolet, infrared, x-ray, radio wave, gamma radiation, and microwave radiation. ‘Rmno Mio| 1R | T | uv X@AY (rAMMJ Long A Shoxt A Low f Hagh £ 3. Which region of the electromagnetic spectrum has the highest frequency? GAMM fr 4. Which region of the electromagnetic spectrum has the longest wavelength? 2pDro 5. Which region of the electromagnetic spectrum will travel with the fastest speed? ML SAME SPEED = 3x108™/s 6. Itis known that electromagnetic waves with longer wavelengths have a greater ability to bend around obstacles that get in their path. This ability to bend around obstacles is referred to as diffraction. Electromagnetic waves with strong diffraction properties are used in communication. Which two regions of the spectrum have the greatest ability to diffract? RADIo 9 Mi(Ro 7. Itis known that electromagnetic waves with high frequency are more capable of causing damage to the organs of living things. Which two regions of the spectrum have the tendency to cause the greatest damage to humans? XRA & cpmmp — uv too! © The Physics Classroom, 2009 Page 1