Wave Interference

Wave Interactions

Multiple Choice

The highest point on a wave is:

• the crest

• the trough

• the top

• the coast

Multiple Choice

Which word is used to identify the distance between points C & G?

• Amplitude

• Crest

• Frequency

• Wavelength

Multiple Choice

Which wave in the diagram has the greatest wavelength?

• 1

• 2

• 3

• 4

Multiple Choice

Which wave in the diagram has the greatest frequency?

• 1

• 2

• 3

• 4

Multiple Choice

The type of waves that require medium to pass:

• Mechanical Waves

• Electromagnetic Waves

Multiple Choice

What types of waves carry energy at a right angle or perpendicular to the direction of the energy flow?

• Longitudinal waves

• Transverse waves

• Sound waves

• P-waves

Multiple Choice

Which wave is pictured?

• Transverse

• Longitudinal

• Both

• Neither

Reflection

 When an object or wave hits a surface

through which it cannot pass, it bounces
back.

 This bouncing back of a wave when it meets

a surface or boundary is called reflection.

Reflection

Refraction

 When a wave moves from one medium into

another medium at an angle, it changes speed
as it enters the second medium. This causes
the wave to bend.

 The bending of waves as they pass from one

medium to another is called refraction.

 “Broken pencil” trick

Refraction

Multiple Choice

when a wave is bent by traveling from one medium to another

• reflection

• refraction

• absorption

• propagation

Multiple Choice

When a wave bounces off of something and moves in a different direction

• reflection

• refraction

• absorption

• propagation

Multiple Choice

Sound needs a medium to travel through.  What is a medium?

• solid, liquid, gas

• open space

• waves

• nothing

Multiple Choice

Which of the following is the bending of a wave, which changes its speed.

• Reflection

• Diffraction

• Refraction

• Frequency

Diffraction

 The bending of a wave as it passes an

edge or an opening (a barrier).

 This is why you can hear sound

around a corner.

Diffraction

Interference

 Waves that exist in the same place at

the same time experience interference.

2 types of Interference

 Constructive: Two crests or two troughs will

add together to make a larger crest or
trough. They do not average out.

 It occurs whenever two waves combine to

make a wave with a larger amplitude.

2 types of Interference

 Destructive: Crest meets trough;

amplitude is smaller or completely
cancels out.

Constructive vs. Destructive

Interference

 Of light: creates rainbows in oil or soap

bubbles.

 Of sound: creates beats in music.

The Doppler Effect

 The apparent change in frequency of a

moving object to the observer.

 Ex: NASCAR, ambulance

Resonance

 Resonance is a wave's ability to match

the natural frequency of an object

 Examples of things that use resonance:

Instruments

Bridges

Resonance: How instruments work

 Musical instruments are set into

vibrational motion at their natural
frequency when a person hits, strikes,
strums, plucks or somehow disturbs the
object.

 This creates resonance and causes

sound, as well as the disruption of other
objects around the instrument.

Multiple Choice

Which of the following is the bending of a wave, which changes its speed.

• Reflection

• Diffraction

• Refraction

• Frequency

Multiple Choice

The combination of two waves to form a larger amplitude is what type of interference?

• Constructive
• Destructive
• Diffractive
• Refractive

Multiple Choice

This is when sound waves reflect or bounce off an an object.

• Echo

• Transmission

• Refraction

• Absorption

Multiple Choice

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

• Refraction

• Diffraction

• Transmission

• Absorption

Multiple Choice

Which type of interaction is this?

• reflection

• refraction

• diffraction

Multiple Choice

Which type of interaction is this?

• reflection

• refraction

• diffraction

Multiple Choice

Which type of interaction is this?

• reflection

• refraction

• diffraction

Multiple Choice

Which type of interaction is this?

• reflection

• refraction

• diffraction

Multiple Choice

It is the highness or lowness of a sound.

• Pitch

• Intensity

• Timbre

• Doppler effect

Multiple Choice

It is the change in wave frequency caused by a moving wave source.

• Pitch

• Intensity

• Timbre

• Doppler effect

Multiple Choice

It is the inducing of vibrations of a natural rate by a vibrating source having the same frequency.

• Refraction of sound

• Diffraction of sound

• Interference

• Resonance

Multiple Choice

What is a general definition of wave interference?

• When a wave bounces off an object

• When more than on wave meet and interact in the same medium

• When a wave bends around a corner

• When a wave creates static

Multiple Choice

What type of interference is occurring in the picture?

• Constructive

• Destructive

Multiple Choice

How can resonance break an object?

• forcing an object to vibrate at its natural frequency for a short time

• forcing an object to vibrate at different frequencies for a short time

• forcing an object to vibrate at different frequencies for a longtime

• forcing an object to vibrate at its natural frequency for a long time

Multiple Choice

True or False: Sound needs a medium.

• True

• False

Multiple Choice

Sound waves are also known as ----- waves.

• Compression

• Longitudinal

• Neither

• Both longitudinal and compression

Multiple Choice

The measure of the amount of energy in a wave is ----

• Wavelength

• Hertz

• Frequency

• Amplitude

Multiple Choice

When waves meet, and form either a larger or smaller amplitude

• Radiation

• Interference

• Diffraction

• Microwaves