Presentation on theme: "Section 1: The Nature of Waves"— Presentation transcript:
1 Section 1: The Nature of Waves The Energy of WavesSection 1: The Nature of Waves
2 Anticipation Guide: True or False Light waves are mechanical waves because they must travel in a mediumIn space, no one can hear an explosionWater waves are a combination of longitudinal and transverse waves
3 What is a wave?Definition: A wave is any disturbance that transmits energy through matter or space.
4 Waves carry energy, not matter Waves use energy to do work on everything in its path. The waves do work on the water to make it move up and down as well as work on the leaf so it bobs up and down with the water.
5 Energy transfer through a medium a wave can be described as a disturbance that travels through a medium, transporting energy from one location to another location.The medium is simply the material through which the disturbance is moving; it can be thought of as a series of interacting particles.
6 Mechanical waves require a medium Sound waves require a mediumOcean waves require a mediumWaves on a string instrument require a mediumA mechanical wave is a wave which is not capable of transmitting its energy through a vacuum. In other words, it requires a medium
8 Energy transfer without a medium Electromagnetic waves are waves that do not require a medium to transmit energyExamples of these are microwaves, TV, x-rays, and radio signalsWhile these types of waves can travel through a medium, they travel faster through empty space
9 Example of an electromagnetic wave Waves in the electromagnetic spectrum vary in size from very long radio waves thesize of buildings, to very short gamma-rays smaller than the size of thenucleus of an atom.
10 Types of WavesWaves can be classified based on the direction that the particles of the medium vibrate compared to the direction in which the waves travel.The two main types of these waves are transverse and longitudinal. If found in combination is called a surface wave.
11 Types of Waves: Transverse Transverse waves have particles that vibrate in an up and down motion moving the waves across in a perpendicular manner to which the wave is travelingRemember that perpendicular means to be at right anglesA rope is an example of a transverse wave.
17 Types of Waves: Combination When waves occur at or near the boundary between two media (air and water for example) transverse wave and a longitudinal wave can combine to form a surface wave.Surface waves look like transverse waves but the particles in the medium move in circles rather than up and down.
18 Types of Waves: Combination Particles move forward at the crest and backward in the trough.
19 Anticipation Guide: True or False electromagneticLight waves are mechanical waves because they must travel in a mediumIn space, no one can hear an explosionWater waves are a combination of longitudinal and transverse wavesXFalseTrueSound waves require a mediumTrueAlso called surface waves.