Chapter #14 - Properties Of Waves Flashcards
What aperatus can halp us understand the properties of waves?
A ripple tank
What is the equation for individual waves?
Velocity = frequency x wavelength
What is the positions of molecules once it passes a wave along?
The molecules reman the same. A wave transfesr energy but not matter
Draw a labled wave diagram
What is the defenition of a crest/peak?
The highest point of a wave.
What is the defenition of a trough?
The lowest point of a wave
Whta is the defenition of a wavelength?
The distance between 2 adjecent crests/toughs of a wave.
What is the defenition of frequency?
The number of waves made each second or waves passing a point per second.
What is the defenition of a period?
The number of seconds it takes for each wave to pass a point.
Equation for frequency?
Frequency = 1 / period
Equation for period?
Period = 1 / frequency
What is the speed of a wave equivalent to?
The speed at which the wave transfers energy from place to place.
What does the speed of a wave depend on?
The amplitude (bigger amplitude, more energy = faster)
A wave transfers energy without transfering ……
Matter
What is defenition of a transverse wave?
A wave in which the vibration is at a right angle to the direction of propagation of the wave.
What is the defenition of a longitudinal wave?
A wave in whichthe vibration is forward and back, parellel to the direction of propagation of the wave.
What are examples of transverse waves?
- Ripples on water
- Light and other electromagnetic waves
- Secondary seismic waves (slow moving vibrations in an eartquake S-waves)
What changes when a wave passes through a different material?
The speed as well as the wavelength of the wave changes.
What are eaxamples of transverse waves?
- Sound waves
- Primmary seismic waves (fast vibrating earthquakes P-waves)
What stays the same when a wave passes through a different material?
The frequency (the number of waves produces made per second) stays the same.
How do speed and direction change when waves travel from a denser to a less dense medium?
Speed: Faster (deep => shallow)
Direction: Away from the normal
How do speed and direction change when waves travel from a less dense to a denser medium?
Speed: slower (shallow => deep)
Direction: Towards the normal
What is the deffinition of refraction?
When a wave spreads out as it travels through a gap or past the edge of an object.
When is diffraction greatest?
When the width of the gap is equal to the wave length of the waves being diffracted.
What happens when a wave passes through a gap?
What factors increase diffraction?
The gap size (bigger => less) (smalle => more)
Draw a diagram of a ray that is reflected and refracted from a object.
The closer the incident is to the normal, the ____ light is reflected
Less, More
Less
