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Published byJames Cain Modified over 4 years ago

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Chapter 15

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Every sound, light and water wave that is heard and seen depends on waves A wave is a disturbance that transfers energy from one place to another A wave can transfer energy over a distance w/o moving the matter the entire distance Forces can send a wave through material

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A medium is any substance that a wave moves through This would include all gases, liquids and solids

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There are 3 types of waves 1. Mechanical- wave that transfers energy through matter 2. Transverse- the direction in which the wave travels is perpendicular, or at right angles 3. Longitudinal- the wave direction travels the same as the direction of the disturbance

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A wave has many properties that help identify and measure it A crest is the highest point, or peak of a wave A trough is the lowest point or valley of a wave Amplitude is the distance b/w a line through the middle of a wave crest or trough The distance from one wave crest to the very next crest is called the wavelength The number of waves passing a fixed point in a certain amount of time is called the frequency

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A wave’s speed can be measured by finding how long it takes for a wave to get from one point to another The formula used to calculate a wave’s speed is: Speed= wavelength x frequency

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Waves bounce The bouncing back of a wave after it strikes a barrier is called reflection Sometimes waves don’t bounce back when it’s in a new medium When a wave enters a new medium at an angle it bends or refracts Refraction is the bending of a wave as it enters a new medium at an angle other than 90 degrees

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Diffraction is the spreading out of waves through an opening or around the edge of an obstacle Diffraction also occurs as waves pass the edge of an obstacle

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Two waves can add energy to take away energy from each other in the place where they meet Interference is the meeting and combining of waves The adding of two waves is called constructive interference b/c it builds up or constructs a larger wave out of two smaller ones Destructive interference usually happens when identical waves meet but are not usually aligned Some crests meet up with crests in some places and troughs in other places

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