Chapter+25

​**Key Definitions** **: **
 * 1) __**Shock wave**__ - Produced by overlapping spheres that form a cone.
 * 2) __**Bow wave**__ - The crests overlaps at the edges and the pattern made by these overlapping crests is a V shape.
 * 3) __**Constructive interference**__ - A wave overlapping the crest of another as their individual effects add together creating an increased amplitude.
 * 4) **__Destructive interference__** - The crest of a wave overlaps the rough of another, their individual effects are reduced and creates a high part of one wave that simply fills in the low part of the other.
 * 5) __**Standing wave**__- certain parts of the waves remain stationary.

**Notes:**.
 * The time of a back-and-forth swing is called a period.
 * The wave length is the distance between sucessive identical parts of the wave
 * A wave carries energy from a vibrating source to a reciever without transferring matter from one to another.
 * The frequency,or the number of vibrations in a given time, multiplied by the wavelength equals the speed of wate
 * Electromagnetic waves, such as light and radio waves, are transverse
 * The change in frequency due to the motion of the source (or receiver) is called the Doppler Effect.
 * A vibration is a wiggle in time, and a wave is a wiggle in time and space.
 * In constructive interference, crest overlaps crest, or trough overlaps trough.
 * In destructive intference, a crest overlaps a trough.
 * In a standing wave, points of complete interference remain at the same location.

**Pictures:**








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Links: **Locate and embed at least 2 links related to the chapter. [] You can find the nature, behavior, and properties of a wave. [] You can find the doplar effect, properties, and interactions of waves.


 * Test Questions: **Create at least 8 questions in the format of multiple choice or true/false.
 * 1) true or false. A wave length is the distance between successive identical parts of the wave
 * 2) True or False. Back and forth vibrating motion of a swinging pendulum is called simple harmonic motion
 * 3) true or false. A wave length is the distance between successive identical parts of the wave
 * 4) A change in frequency due to the motion of the source or receiver is called doppler effect
 * 5) True/False- the time of a back-and-forth swing is called a Period.
 * 6) True/False- the wavelength of a wave is the distance from the top of one crest to the top of the next one.
 * 7) what is the strongest wave??
 * 8) The wave speed does not depend on the medium through which the wave moves
 * 9) A wiggle in time is called a wave

10. True or False. Frequency is measured in Hertz.

**Record the aswers to the above questions at the link below** Answers to Test Questions