CK-12 Physical Science - For Middle School

20.2. Hearing Sound http://www.ck12.org FIGURE 20.8 This highly magnified image of a hair cell shows the tiny hair-like structur ...

http://www.ck12.org Chapter 20. Sound Preventing Hearing Loss Hearing loss caused by loud sounds is permanent. However, this typ ...

20.2. Hearing Sound http://www.ck12.org such as the voices of co-workers, are not interfered with in this way and may be amplifi ...

http://www.ck12.org Chapter 20. Sound Apply Concepts Write a public service announcement warning people of the dangers of loud ...

20.3. Using Sound http://www.ck12.org 20.3 Using Sound Lesson Objectives Explain how musical instruments produce sound. Identif ...

http://www.ck12.org Chapter 20. Sound FIGURE 20.12 A drum, saxophone, and violin represent the three basic categories of musical ...

20.3. Using Sound http://www.ck12.org Echolocation Animals such as bats, whales, and dolphins send out ultrasound waves and use ...

http://www.ck12.org Chapter 20. Sound FIGURE 20.14 Sonar works on the same principle as echolocation. Problem:The sonar device o ...

20.3. Using Sound http://www.ck12.org KQED: Music of the Sun In this QUEST web extra, Stanford University astrophysicist Todd Ho ...

http://www.ck12.org Chapter 20. Sound Points to Consider In this chapter, you read about sound waves, which start with a disturb ...

20.4. References http://www.ck12.org 20.4 References Mark Hillary. http://www.flickr.com/photos/markhillary/361796692/. CC BY 2 ...

http://www.ck12.org Chapter 21. Electromagnetic Radiation CHAPTER 21 Electromagnetic Radiation Chapter Outline 21.1 Electromagne ...

21.1. Electromagnetic Waves http://www.ck12.org 21.1 Electromagnetic Waves Lesson Objectives Describe electromagnetic waves. Ex ...

http://www.ck12.org Chapter 21. Electromagnetic Radiation an area of electrical force surrounding a charged particle. Like a mag ...

21.1. Electromagnetic Waves http://www.ck12.org FIGURE 21.2 An electromagnetic wave starts with a vibrating charged particle. Ho ...

http://www.ck12.org Chapter 21. Electromagnetic Radiation developed a new theory about electromagnetic radiation, called the wav ...

21.1. Electromagnetic Waves http://www.ck12.org Lesson Review Questions Recall Define electromagnetic radiation. What is an ele ...

http://www.ck12.org Chapter 21. Electromagnetic Radiation 21.2 Properties of Electromagnetic Waves Lesson Objectives Describe t ...

21.2. Properties of Electromagnetic Waves http://www.ck12.org Wavelength and Frequency of Electromagnetic Waves Although all ele ...

http://www.ck12.org Chapter 21. Electromagnetic Radiation Therefore, if either wavelength or frequency is known, the missing val ...