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# Inquiry on waves knowledge handouts and notes

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• 2. Grade 8 Vocabulary List 11. wave2. mechanical3. electromagnetic4. amplitude5. wavelength6. frequency7. reflection8. refraction9. diffraction10. pitch11. resonance12. overtone13. eardrum14. radiant15. spectrum16. infrared17. radiation18. gamma ray19. medium20. lens21. retina22. inquiry** Need to write for each word:1. Definition2. Your own sentence
• 3. _____________________________________________ (Summary for Section 1 of Chapter 16)(Main Idea)Waves are a kind of _____________________________ and possess certain properties. There are alsodifferent kinds.(Supporting Idea 1)Waves are ____________________ that have rhythm. They carry ____________ but________________________.(Details)Waves can occur in water from running boats. Also, the sound made from a streak of lighting is a wave.It is important to emphasize that waves cause energy to move –but- no matter moves.(Supporting Idea 2)Scientists believe many waves (but not all) work by molecules ____________________. This is a modelonly.(Details)One molecule has energy. It then passes some energy to the next molecule. That molecule passes it toanother molecule and so on. It is similar to passing a ball.(Supporting Idea 3)Mechanical waves always transfer energy through molecules. So they need some____________________ that has molecules in it to work.(Details)For example, water waves work through water molecules. Sound waves travel through almost any solid,liquid or gas such as air.(More Details)One kind of mechanical wave is a ____________________. Here, energy is passed by moleculesmoving ________________________ or at right angles to the direction the wave travels. There arepeaks and valleys called crests and troughs. See figure 3 on page 464. The peaks are called crestsand the valleys are called troughs.(More Details)Another kind of mechanical wave is a _______________________. Here, molecules move forward andbackward along the direction the wave moves in. See figure 4 on page 464. The molecules move alittle but they always return to the original positions. Only energy travels somewhere. A coiled spring is agood example.(Supporting Idea 4)_______________________ are a common example of compressional waves. They are produced bysomething that is vibrating.(Details)When some object vibrates, it may first move up. As a result, molecules are pushed closer together.This is called a compression. Then the object moves down. As a result, the molecules have more roomand spread out and away. This is called a rarefaction. This action is repeated again and again as theobject continues to vibrate going up and down. The series of compressions and rarefactions forms thesound wave. See figure 5.
• 4. (Supporting Idea 5)Electromagnetic Waves _________________________ so they can travel in space.(Details)Examples include radio waves, visible light waves and ultraviolet rays. The _______________ alsoproduces many kinds of electromagnetic waves.
• 5. SUMMARY – Organizer Handout (for Chapter 16, Section 2, pg. 467) Reading NotesStep 1: Read one time. * Take notes too if you want! Step 2:Write the Main Idea (1-2 sentences) –______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Step 3: Write the supporting ideas. Write in the small boxes first!Step 4: Write the supporting details. Write in the bigger boxes later!Supporting Idea 1 (1-2 sentences)Supporting Details 1 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 2 (1-2 sentences)Supporting Details 2 (1+ sentences)__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
• 6. Supporting Idea 3 (1-2 sentences)Supporting Details 3 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 4 (1-2 sentences)Supporting Details 4 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 5 (1-2 sentences)Supporting Details 5 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
• 7. Supporting Idea 6 (1-2 sentences)Supporting Details 6 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 7 (1-2 sentences)Supporting Details 7 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 8 (1-2 sentences)Supporting Details 8 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
• 8. 1 Missing Handout after Computer Crash-- Summary note on Wave Behavior (Chapter 16, Section 3, page 472)* see me for these if you need them until I fix this problem. Sorry!
• 9. What are Electromagnetic Waves?An electromagnetic wave is a special kind ofwave that is produced by charged particlesin motion. It does not require a medium totravel in.How does an Electromagnetic WaveWork?An electromagnetic wave carries radiantenergy. Almost anywhere in the universe,there exists various charged particles suchas electrons or protons. (even in space!)Charged particles are special because theyare surrounded by electric fields. Anelectric field is some kind of force field. electric fieldEx. a proton
• 10. As well for certain reasons, a chargedparticle may start moving. When a chargedparticle starts moving, a second kind of forcefield is formed: a magnetic field. (just likewith a magnet) magnetic fieldEx. an electronFinally, when a charged particle is movingup and down, its electric field and itsmagnetic field move farther and farther awayin many directions. They also move with awave like motion. Eventually, the electricfield may strike another charged particle andcause it to move. Then, this particleproduces both an electric field and amagnetic field. In the process, the wavecontinues through the movement of its twoforce fields. As more and more chargeparticles are hit, their vibration extends thewave and energy thus moves.(see figure 5 on pg. 523)
• 11. SUMMARY – Organizer Handout (for Chapter 18, Section 2, pg. 525) Reading NotesStep 1: Read one time. * Take notes too if you want! Step 2:Write the Main Idea (1-2 sentences) –______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Step 3: Write the supporting ideas. Write in the small boxes first!Step 4: Write the supporting details. Write in the bigger boxes later!Supporting Idea 1 (1-2 sentences)Supporting Details 1 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 2 (1-2 sentences)Supporting Details 2 (1+ sentences)__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
• 12. Supporting Idea 3 (1-2 sentences)Supporting Details 3 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 4 (1-2 sentences)Supporting Details 4 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 5 (1-2 sentences)Supporting Details 5 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
• 13. Supporting Idea 6 (1-2 sentences)Supporting Details 6 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 7 (1-2 sentences)Supporting Details 7 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Supporting Idea 8 (1-2 sentences)Supporting Details 8 (1+ sentences)_________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________