Unit 3 Lesson 2 Properties of Waves. Copyright Houghton Mifflin Harcourt Publishing Company
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2 Florida Benchmarks SC.7.P.10.3 Recognize that light waves, sound waves, and other waves move at different speeds in different materials. MA.6.A.3.6 Construct and analyze tables, graphs, and equations to describe linear functions and other simple relations using both common language and algebraic notation.
3 Florida Benchmarks LA The student will record information (e.g., observations, notes, lists, charts, legends) related to a topic, including visual aids to organize and record information and include a list of sources used.
4 Amp It UP! How can we describe a wave? Waves can be described by basic properties. In a transverse wave, there are special terms for the maximum displacement of particles in the wave. The highest points are crests; the lowest points are troughs.
5 How can we describe a wave? A wave s amplitude is a measure of how far particles in the medium move away from their normal rest position. Wavelength is the distance over which the wave s shape repeats. Wavelength is the distance from any point on a wave to an identical point later on the wave.
6 How can we describe a wave? What is the wavelength of this wave? What is the wave s amplitude?
7 How can we describe a wave? Another property is wave period, the time required for one wavelength to pass a given point. Frequency is also a way to express how far apart waves are in time. It is the number of crests that pass a point in a certain amount of time.
8 How can we describe a wave? Frequency is measured in hertz (Hz). One hertz equals one wavelength per second. Frequency is the inverse of period.
9 Amp It Down What affects the energy of a wave? Some waves carry more energy than others. Friction has a dampening effect on waves, meaning it causes them to lose energy. The amount of energy a mechanical wave carries determines its amplitude.
10 What affects the energy of a wave? The amplitude of a sound wave corresponds to its volume. In an electromagnetic (EM) wave, energy depends on frequency as well as amplitude. High-frequency waves carry more energy than low-frequency waves.
11 What affects the energy of a wave? Many waves spread out in circles or spheres, called wave fronts. As the circle expands, there is less energy available on the wavefront.
12 A Happy Medium What determines the speed of a wave? Wave speed, or the speed at which waves travel, depends on the properties of the medium. Waves tend to travel slower in a denser medium.
13 A Happy Medium What determines the speed of a wave? In gases, wave speed is higher in higher temperatures. All electromagnetic waves travel at the same speed in empty space, but they travel more slowly through a denser medium.
14 What determines the speed of a wave? Wave speed can be calculated from frequency and wavelength. Speed is a distance divided by time.
15 What determines the speed of a wave? Wave speed is a wavelength divided by wave period. This relationship can be combined with the relationship between wavelength and frequency. The wavelength is equal to the wave speed divided by its frequency.
Florida Benchmarks. SC.7.P.10.3 Recognize that light waves, sound waves, and other waves move at different speeds in different materials.
Unit 3 Lesson 1 Waves Florida Benchmarks SC.7.P.10.3 Recognize that light waves, sound waves, and other waves move at different speeds in different materials. Copyright Houghton Mifflin Harcourt Publishing
Waves. Mechanical Waves A disturbance in matter that carries energy from one place to another.
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