Wave Behavior Relfection, Refraction, Diffraction.

Reflection Reflection occurs when a wave strikes an object and bounces off of it. Reflection occurs when a wave strikes an object and bounces off of it. All types of waves  including sound, water, and light waves  can be reflected All types of waves  including sound, water, and light waves  can be reflected

Reflection When a wave bounces off a barrier or surface it is said to be reflected. How much of the wave that is reflected depends on the impedance between the two mediums. When a wave bounces off a barrier or surface it is said to be reflected. How much of the wave that is reflected depends on the impedance between the two mediums. Impedance describes the difference in densities of the two mediums, the greater the difference in mediums, the greater the impedance. Impedance describes the difference in densities of the two mediums, the greater the difference in mediums, the greater the impedance. As the impedance increases, more of the wave's energy is reflected instead of being transmitted into the next medium. As the impedance increases, more of the wave's energy is reflected instead of being transmitted into the next medium.

Echo Sometimes when the sound waves hit another object, they reflect off it and come back to you. Sometimes when the sound waves hit another object, they reflect off it and come back to you. Your ears hear the sound again, a few seconds after you first heard your footstep. Your ears hear the sound again, a few seconds after you first heard your footstep.

Sonar How does a bat use reflection to find food? How does a bat use reflection to find food?

Law of Reflection The angle formed by the incident beam and the normal is the angle of incidence. The angle formed by the incident beam and the normal is the angle of incidence. The angle formed by the reflected beam and the normal is the angle of refection. The angle formed by the reflected beam and the normal is the angle of refection. According to the law of reflection, the angle of incidence is equal to the angle of refection. All reflected waves obey this law. According to the law of reflection, the angle of incidence is equal to the angle of refection. All reflected waves obey this law.

Types of Reflection

Refraction When a wave passes from one medium to another  such as when a light wave passes from air to water  it changes speed. When a wave passes from one medium to another  such as when a light wave passes from air to water  it changes speed. If the wave is traveling at an angle when it passes from one medium to another, it changes direction, or bends, as it changes speed. If the wave is traveling at an angle when it passes from one medium to another, it changes direction, or bends, as it changes speed.

Glass and light

Refraction Refraction is the bending of a wave caused by a change in its speed as it moves from one medium to another. Refraction is the bending of a wave caused by a change in its speed as it moves from one medium to another.

Sound refraction Sound wave will refract if there is a difference in air temperature. The different densities cause the waves to bend.

Snell’s Law n 1 : index of refraction for incidence medium q 1 : angle of incidence n 2 : index of refraction for refractive medium q 2 : angle of refraction _________________________________________________________________ Speed of an EM wave in a Medium v = c/n The index of refraction is defined as the speed of light in vacuum divided by the speed of light in the medium.refractionspeed of light

Critical Angle The angle of incidence that produces total internal reflection. The angle of incidence that produces total internal reflection.

Interference When waves appear at the same point in space and time and combine. (superposition) When waves appear at the same point in space and time and combine. (superposition) ConstructiveDestructive

Diffraction Diffraction occurs when an object causes a wave to change direction and bend around it. Diffraction occurs when an object causes a wave to change direction and bend around it. Diffraction and refraction both cause waves to bend. The difference is that refraction occurs when waves pass through an object, while diffraction occurs when waves pass around an object. Diffraction and refraction both cause waves to bend. The difference is that refraction occurs when waves pass through an object, while diffraction occurs when waves pass around an object.

Diffraction