7th Grade Science Waves Study Guide 1. A student ties one end of a rope to a tree and holds the other end in his hand, then moves the rope up and down, as shown below. The resulting wave travels up and down through the rope. This type of mechanical wave would be A. transverse wave B. longitudinal wave C. compressional wave D. earthquake wave 2. Two students lay a slinky in the floor. One student holds their end still while the other student pushes their end forward. The resulting wave travels back and forth through the slinky. This type of mechanical wave would be A. transverse wave B. longitudinal wave C. light wave D. radio wave 3. A. B. C. D. All electromagnetic waves require a medium to travel through do not require a medium to travel through travel at the speed of light both B and C are true 4. Consider the picture below: This wave could be A. a light wave C. an electromagnetic wave B. a mechanical wave D. All of these choices are correct. 7th Grade Science Waves Study Guide Use the triangle below to help you answer numbers 5, 6, and 7. v λ f 5. What is the wavelength of a 250 Hz wave if its speed is 275 m/s? 6. A trumpet produces a sound with a wavelength of 3.6 meters. What is the frequency of the sound if the speed is 348 m/s? 7. What is the frequency of a water wave if its speed is 27 m/s and its wavelength is 15 meters? 8. What is the frequency of the wave below if its speed is 5 m/s? 7th Grade Science Waves Study Guide 9. Consider the two waves below. Wave A Tell the difference(s) between the Wave A and Wave B. Wave B 10. Which of these actions produces an actual wave? A. a skateboard going down a hill B. a ball rolling across the floor C. a rabbit jumping up and down through the grass D. a violin being played 11. Which of the following produces an electromagnetic wave? A. a trumpet being played B. a boat going through the water C. the sun D. a slinky 12. Which of the following is correct about a transverse wave? A. Waves with short wavelengths have less energy. B. Waves with short wavelengths have more energy. C. Waves with high frequencies have less energy. D. Waves with low amplitudes have high energy. 13. Electromagnetic waves can travel through space. Which of the following is true? A. Electromagnetic waves are mechanical waves. B. Electromagnetic waves can be longitudinal waves. C. Electromagnetic waves must have a medium through which to travel. D. Electromagnetic waves can travel through a vacuum and do not require a medium. 14. Transverse waves A. are sound waves. C. can be mechanical or electromagnetic. B. ALWAYS require a medium to travel. D. are also called compressional waves. 15. Which of the following is NOT an electromagnetic wave? A. radio wave B. sound wave C. ultraviolet wave D. infrared wave 7th Grade Science Waves Study Guide 16. Use the electromagnetic spectrum below to answer numbers 15-16. Which of the following has a frequency that is lower than visible light? A. UV rays B. Gamma rays C. infrared waves D. X ray 17. Which of the following has a wavelength longer than infrared waves? A. UV light B. X rays C. Gamma rays D. Radio waves 18. Where do microwaves fall on the electromagnetic spectrum? A. between gamma rays and X rays B. between radio waves and infrared C. between visible light and infrared D. between visible light and X rays 19. Label the wavelength, amplitude, crest, and trough on the wave below. 20. Rank the waves below in order from highest to lowest frequency.
