6.6.2.2 properties of electromagnetic waves 1 Flashcards
Varying with wavelength, different substances may absorb…
Transmit, refract of reflect electromagnetic waves.
Some effects, are due to the difference in velocity of the waves in different substances, for example..
Refraction.
Refraction is?
Light appearing to change direction as it passes through water
Waves can change direction when they..
Change speed, moving from one medium to another.
When light passes from air into glass, the velocity of light ______ (the light waves slow down)
Decreases, causing the direction of the waves to change.
When waves passes through the glass from air, the velocity of light decrease then bends towards the normal. When the waves pass from the glass back to the air the velocity..
Increases and changes back to original speed- bending away from the normal.
When does refraction occur
When any wave changes speed as it passes from one medium to another.
If the waves enter of the leave the medium at right angel to the surface (along the normal) then they…
Do not change direction.
What is a wavefront?
The wavefront is an imaginary line that connects all the same points in a set of waves. For example, the wavefront of the peaks/ crests of the wave or trough of the wave.
When the first wave fronts move into the glass, those parts of the wavefronts…..?
Slow down.
What happen to the first wavefronts when entering glass from air?
The wavefronts get closer together, causing the waves to change direction towards the normal. The waves are refracting
When wave fronts approaching along the normal, the wavefronts slow down when passing through the glass, however, the _____ wave front ______ down at the same time, causing __ _______ in the direction.
Whole,
slows,
no change
