Wave Interactions

Wave Interactions

•Reflection

•Happens when a wave bounces on an object in its path, and changes direction.

Reflection

All waves can be reflected.

•When a sound wave bounces off a surface we speak of “echo”.

•The reflected waves are identical to the incoming waves

Absorption

Not all waves are always reflected.

Some materials are able to trap

Waves, particularly light

waves.

Depending on the wavelengths that are trapped, we will be able to se the complementary color

Color

•White light is the combination of many individual light wavelengths.

•The color we see is the light that bounces off an object.

•The object absorbs allother light wavelengths.

Multiple Choice

Light waves bouncing off a surface is known as?

• Transmission

• Refraction

• Reflection

• Absorption

Multiple Choice

This is when waves reach an object and cannot pass or bounce off.

• Transmission

• Refraction

• Reflection

• Absorption

Multiple Choice

When white light is partially absorbed and partially reflected we see.

• Transmission

• Refraction

• No light

• Color

Transmission–

Waves pass through a substance or material which can be:      

•Transparent– visible light is transmitted easily and objects are seen clearly.

•Translucent– some visible light is transmitted, but some is scattered, (diffused or bent in many directions), so that objects are not clearly seen

Multiple Choice

This is the term that describes when light passes through matter.

• Translucent

• Transparent

• Opaque

• Transmission

Multiple Choice

This describes an object where light passes through completely without any obstruction.

• Opaque

• Translucent

• Transmission

• Transparent

Multiple Choice

This describes an object where light passes through, but not as clearly or easily.

• Transmission

• Transparent

• Opaque

• Translucent

Refraction–

Is the change in direction of a wave when it changes its speed as it travels from one medium into another.

Diffraction

Waves bend when they pass around an edge or through a narrow opening.

Different wavelengths bend at different angles.

Short wavelengths are bent more than long ones.

Multiple Choice

This is when light changes speed and direction slightly when it passes from one material to another.

• Transmission

• Absorption

• Refraction

• Reflection

Interference

Happens when two waves overlap or cross paths.

The interaction can be:

Constructive: amplitude increases.

The wave grows

Destructive: amplitude decreases.

Waves cancel out, even disappear.

Resonance– 

Vibration produced in one object that is caused by the transmission through a MEDIUM of the vibration produced in another

Multiple Choice

Which word best describes the material shown in the picture?

• Transparent

• Opaque

• Translucent

• Clear

Multiple Choice

Which type of interaction is shown in the image?

• Destructive Interference

• Absorption

• Constructive Interference

• Reflection

Multiple Choice

The crest of a wave with an amplitude of 5m crashes into the crest of another wave with an amplitude of 3m. What will the amplitude of the resulting wave be?

• 2 meters

• 12 meters

• 6 meters

• 8 meters

Multiple Choice

When you place things into water they sometimes look bent (see the image). What is this an example of?

• Transmission

• Refraction

• Diffraction

• Absorption