<p> 20 Questions Wave Review 7th Grade Science, Mrs. Clark</p><p>Name: ______</p><p>You may use your textbook or notes to answer the following questions (front and back) as you prepare for Friday’s Waves Test. This sheet will be a HW grade.</p><p>1. What is the top of a wave called? ______</p><p>2. What is the bottom of a wave called? ______</p><p>3. What is frequency?</p><p>4. If a wave is traveling at 60 cm/second and has a wavelength of 15 cm, what is the frequency?</p><p>5. What does amplitude measure?</p><p>6. On the diagram below, indicate with an arrow the distance that represents the wavelength of the wave. With another arrow indicate the distance that represents the amplitude. Also label the crest and trough. </p><p>7. How many complete waves are there in the diagram above? Is it transverse or longitudinal?</p><p>8. Why can’t you calculate the frequency of this wave? What information is missing?</p><p>9. What is the difference between a transverse wave and a longitudinal wave?</p><p>10. Are sound waves transverse waves or longitudinal waves? Why? 11. Label the below pictures as either longitudinal or transverse, and then label the following: trough, crest, compression, rarefaction, wavelength and amplitude.</p><p>12. Are Seismic Waves (earthquake waves) longitudinal or transverse? Explain.</p><p>13. What is the difference between mechanical waves and electromagnetic waves?</p><p>14. What are examples of mechanical waves? Electromagnetic waves?  Mechanical wave examples:  Electromagnetic wave examples: </p><p>15. Are light waves mechanical or electromagnetic? Explain.</p><p>16. Are light waves longitudinal or transverse? Explain.</p><p>17. What is the difference between reflection and refraction? </p><p>18. ______is when an object causes a wave to change direction and bend around it. It can also occur when a wave passes through a small opening.</p><p>19. ______is when two waves combine to form a larger wave than the original two. </p><p>20. ______is when two waves cancel each other out, leaving a smaller wave in place of the original two.</p>