Waves Flashcards
If light enters a new material and slows down is the angle of refraction bigger or smaller than the angle of incidence?
Smaller than
If light enters a new material and speeds up is the angle of refraction bigger or smaller than the angle of incedence?
Bigger than
TRUE OR FAULSE
The speed of light always changes
TRUE
TRUE OR FAULSE
The speed of light sometimes changes
FAULSE
TRUE OR FAULSE
The direction of light always changes
FAULSE
TRUE OR FAULSE
The direction of light sometimes changes
TRUE
Where will the light go in a:
Glass rectangle block
0 degrees (along the normal)
Pass straight through
Where will the light go in a:
Glass rectangle block
Angle greater than 0 degrees
Change direction
Where will the light go in a:
Glass semi circle block
Enters the round block side
Direction changes when it leaves the glass block
Where will the light go in a:
Glass semi circle block
Enters the flat block side
It will change direction and pass straight through the round edge of the block
Where will the light go in a:
Glass triangular prism block
Greater than 0 degrees
Change direction. Bend towards normal and then bend away from the normal.
What do waves do?
What is wavespeed?
- Waves transfer energy
- Wave speed refers to the speed at which a wave travels through a medium
When does diffraction occur?
Pass through a gap or around an object
Longer wavelength waves have … diffraction than … wavelengths. So longer waveengths diffract … than … wavelengths.
Greater
Shorter
Shorter
More
EM
What has a longest wavelength
Radio waves
EM
What has the shortest wavelength
Gamma Rays
EM
What has the highest frequency
Gamma Rays
EM
What has the lowest fequency
Radio waves
All radiations in the electromagnetic spectrum are … waves and travel at the speed of … which is …
Transverse
Light
3 X 10 8 m/s
What is refraction?
Refraction occurs when waves pass from one medium to another
Describe refraction in terms of change of wave speed
Refraction is the change of speed of a wave as it passes from one material to another
Dense
Describe the change in wavelength
Air to glass the wavelength will decrease.
More dense to less dense the wavelenght increases.
Describe the change of direction (angle is greater than 0 degrees)
Light will only change direction when it strikes an object at an angle of instadence greater than 0 degrees. Pass through normal mean straight.
Going from a less dense to more dense then your light will refract or bend …
towards the normal
Going from a more dense to less dense then the light will refract or bend …
Away from the normal
Longitudinal Wave
A longitudinal wave is one where the particles vibrate along the same direction of the wave
Transverse Wave
A transverse wave is one where the particle moves at right angles (90 degrees) to the direction of travel of the wave.
Frequency
The number of waves per second or number of waves passing a point per second.
Period
The time taken for one wave to pass a point. (Inverse of the frequency.)
Diffraction
The bending of waves through gaps or around objects
Refraction
The change in speed of light as it passes from one medium to another (e.g. from air to glass)
