Chapter 17 Waves Study Guide Longitudinal Transverse Surface Waves Water Waves Combo longitudinal and transverse Refraction Diffraction Reflection Sound takes time to hit walls of a cave and since the wave can not pass through it reflects back. Why do you hear echoes? The material in the egg carton absorbs the sound waves. How do egg cartons sound proof your room? What is wavelength? What is the amplitude? What is the difference between Frequency and Speed? Frequency is the amount of waves that go by in a given period of time. Speed is distance traveled in any amount of time. The door prevented the wire from vibrating which prevented any sound waves from traveling. Why did the homemade phone (with the two cups and wire) not work when the door was shut? d. constructive interference What happens when two waves meet and create a wave with a taller amplitude? a. destructive interference c. a date b. no one knows d. constructive interference d. All of the above Which type of mechanical wave needs a source of energy to produce it? a. Transverse wave Longitudinal wave Surface wave All of the above b. c. d. The wave must enter a new medium at an angle. Describe how a wave must enter a new medium in order to refraction to occur. c. Longitudinal wave Which wave cause the medium to vibrate only in a direction parallel to wave’s motion? a. Transverse wave Surface wave Longitudinal wave None of the above b. c. d. c. Enter a new medium at an angle For refraction to occur in a wave, the wave must a. Strike an obstacle larger then the wavelength Change direction within a medium Enter a new medium at an angle Enter a new medium head-on b. c. d. Draw a picture of refraction. Air, water, rope, metal List some of the types of media that can transport waves. c. Like a slinky In an earthquake, a P wave is a longitudinal wave. It moves through soil and rock a. Wavy line Not at all Like a slinky Like an ocean wave b. c. d. d. None of the above Amplitude is a. How high the wave gets How wide the wave gets The pitch of the wave None of the above b. c. d. d. reflection When a wave strikes a solid barrier, it behaves like a basketball hitting a backboard. This wave barrier is called a. Constructive interference Diffraction Refraction Reflection b. c. d. longitudinal A wave in a rope is a transverse wave, but a sound wave is a(n) ___________ wave. b. Transfer energy through a medium Transverse and longitudinal waves both a. Have compressions and rarefactions Transfer energy through a medium Move at right angles to the vibration of the medium Are capable of moving the medium a long distance. b. c. d. d. Surface wave A disturbance sends ripples across water in a tub. These ripples are an example of a a. Rarefaction Longitudinal wave Compression Surface wave b. c. d. d. The Doppler effect An ambulance siren sounds different as it approaches you than when it moves away from you. What scientific term would you use to explain how this happens? a. Ultrasound Diffraction Rarefaction The Doppler effect b. c. d. b. Longitudinal wave A sound wave is an example of a a. Transverse wave Longitudinal wave Standing wave Surface wave b. c. d. c. The time delay of the returning echoes Sonar equipment sends sound waves into deep water and measures a. Refraction of the transmitted wave Only the direction of the reflected wave The time delay of the returning echoes Interference of the transmitted and reflected waves b. c. d. energy You can make a wave in a rope by adding ____________ at one end of the rope. d. All of the above a. b. A mechanical wave moves through a medium, which can be Liquid c. gas Solid d. all of the above perpendicular Wave in a rope are transverse wave because the medium’s vibration is __________to the direction in which the wave travels. Surface waves A pebble drops straight down into a tub of water, setting off __________ in the direction in which the wave travels. wavelength In a transverse wave, _________is measured form crest to crest or from trough to trough. refraction When white light enters a prism and then air around it separates into the different colors. This is an example of decibel The standard measure used to compare sound intensities is the Doppler Effect When a train streaks by blowing its whistle, the changing pitch you hear is due to the Sound waves, like other kinds of waves, reflect, or bounce back, when they strike a solid barrier. It takes time for the echo to return, traveling at the speed of sound, so there is a delay In a large cave, you can hear an echo a few seconds after you speak. Explain how this happens in terms of wave properties. A medium is the material through which a mechanical wave travels. What is a medium? The wave will bend or diffract Consider a wave approaching a barrier with a small hole. What change Is the wave likely to undergo as it encounters the barrier? Shorter, faster vibrations I have one short tuning fork and one long tuning fork. Which one will have a higher pitch? Why does it have a higher pitch (do not say because it is shorter or longer!) A longitudinal wave What type of mechanical wave is produced by a slinky? Weather radar Give one example of the Doppler effect? Hertz, cycles per second, 1/s In what unit is wave frequency measured? Sonar, imaging Give one example of an ultrasound. In reflection, a wave hits a solid barrier that it cannot penetrate, so it reflects, or bounces back, in roughly the same direction from which it came. In refraction, a wave hits a change in the medium, but instead of reflecting (bouncing back), it continues on into the new medium, bending as its speed changes. Explain the difference between reflection and refraction. The sun What is the primary source of energy for Planet Earth?