Is this a wave? YE

S

http://wavewaterworks.com/www-content/uploads/2013/08/wave-energy.jpg

Will this make a wave? YE

S

http://i.huffpost.com/gen/1073332/original.jpg

Is this a wave?

YES

http://www.npr.org/assets/img/2014/04/08/compressionwave.gif

What is a wave?

What is a wave?

A wave is a disturbance propagated from one place to another with no actual

transport of matter

Classifications of a wave

EM waves vs Mechanical wavesTransverse vs Longitudinal

Mechanical waveMotion requires a medium

Electromagnetic waveMotion does not need a medium

Electromagnetic wave

http://imagine.gsfc.nasa.gov/educators/gammaraybursts/starchild/Image6.gif

Transverse waveDisplaces particles

perpendicular to the motion of the wave

https://upload.wikimedia.org/wikipedia/commons/b/b6/Wave_in_a_rope.png

Longitudinal waveCause the particles of a

medium to move parallel to the direction of motion of

the wave

http://3.bp.blogspot.com/-iV7FuAhDdiY/TZMZS7G75tI/AAAAAAAAACc/Ds700IGPvVA/s1600/Longitudinal+Wave.jpg

Longitudinal wave

Has a crowded area causing a high-pressure

region called compression, and the opposite is rarefaction

Periodic motionThe repetitive motion of a particle about the

equilibrium position caused by a restoring force when it is displaced

Simple Harmonic Motion (SHM)

within the elastic limit, the distortion in an object is directly proportional to the distorting force

If the restoring force obeys Hooke’s law, then the resulting vibration is called Simple Harmonic Motion

(SHM)

Hooke’s law

Periodic Wave Characteristics

Wavelength (λ)The distance from crest to crest (or trough to trough);

expressed in meters

Periodic Wave Characteristics

Amplitude (A)The distance of crest (or trough) from the midpoint of

the wave

Periodic Wave Characteristics

Frequency (f)The number of waves that passed a fixed point per

second; measured in hertz (Hz)

Periodic Wave Characteristics

Period (T)The time it takes a wave to travel a distance equal to

a wavelength; measured in second

T= 1/f

Periodic Wave Characteristics

Wave velocity (v)distance travelled by a wave crest in one period

v= λ/T

Reflection

Wave changes direction upon hitting a

reflecting surface

Refraction

Wave changes direction upon

entering a medium of different density

Constructive interference

Destructive interferenceZero displacement

Large resultant displacement

Constructive interference

Destructive interference

Two interacting waves are in-phase

Two interacting waves are out-of-phase

http://www.quantumactivist.com/wp-content/uploads/2014/12/maxresdefault.jpg

Diffraction

Bending of waves upon interacting with an

obstacle