P5f: Nature of Waves

Particles can behave like waves. At other times waves behave like particles. The nature of waves and the interaction of particles is fundamental to our understanding of the world around us. This item looks at the most important of all wave properties – interference. When people talk about interference they usually mean ‘noise’ in an electronic system or ‘crackle’ in a radio receiver. In the topic of waves, interference means the effect produced when two waves meet and interact with each other

HideShow resource information
What is interference?
An effect resulting from two waves that overlap.
1 of 24
What two ares are there when waves overlap?
areas where the waves add together and areas where the waves subtract from each other.
2 of 24
How does light travel?
In straight lines
3 of 24
What is the evidence that light travels in straight lines?
Sharp shadows and eclipses.
4 of 24
What can light do under certain circumstances?
Bend.
5 of 24
Which types of waves are transverse?
All types of electromagnetic waves.
6 of 24
Describe reflection of light in terms of a particle model.
The particles of light would bounce off a surface as they hit it.
7 of 24
In what two ways have scientists described light over time?
As waves and as particles.
8 of 24
What is reinforcement?
Where waves add together.
9 of 24
What is cancellation?
Where waves subtract from one another.
10 of 24
What are coherent wave sources needed to produce?
A stable interference pattern.
11 of 24
What are the coherent wave sources for light?
Monochromatic light.
12 of 24
What is destructive interference?
When waves add together
13 of 24
What is destructive interference?
When waves subtract from one another
14 of 24
Describe the properties of coherent wave sources.
The same frequency and amplitude and in phase with each other.
15 of 24
Describe diffraction of light for a single slit
Waves from different parts of the slit interfere with one another. The central bright fringe is wider than the other bright fringes and he central bright fringe is wider than the other bright fringes.
16 of 24
Describe diffraction of light for a double slits
The 2 sets of diffracted waves interfere with one another&form an interference pattern.This's seen on a screen as bright bands are seen where constructive interference has happened&dark bands are seen where destructive interference has happened
17 of 24
What are interference patterns evidence for?
The wave nature of light
18 of 24
What is plane polarised light?
Light that has passed through polarising filter.
19 of 24
What can all electromagnetic waves do because they are transverse waves?
They can be plane polarised.
20 of 24
Explain a diffraction pattern for light?
Size of gap must be of the order of the wavelength of light otherwise light won't be diffracted much,this light from each of these points interferes w light diffracted from all the other points.So u get an interference pattern even from just 1 slit
21 of 24
Explain how polarisation is used in the application of Polaroid filters and sunglasses.
Light from some substances (water) is partially plane polarised and Polaroid sunglasses make use of this to reduce the glare from the Sun and surfaces such as water in a pool.
22 of 24
Why is the particle theory of light not universally accepted?
A particle theory cannot explain interference patterns, which support the idea of light as waves.
23 of 24
Explain how the wave theory of light has supplanted the particle theory, as the evidence base has changed over time.
Huygens thought that light existed as longitudinal waves-which cannot be polarised.So,at first,it appeared that light couldn't exist as waves cuz light can be polarised.However,polarisation is easily explained if light exists as transverse waves
24 of 24

Other cards in this set

Card 2

Front

What two ares are there when waves overlap?

Back

areas where the waves add together and areas where the waves subtract from each other.

Card 3

Front

How does light travel?

Back

Preview of the front of card 3

Card 4

Front

What is the evidence that light travels in straight lines?

Back

Preview of the front of card 4

Card 5

Front

What can light do under certain circumstances?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Waves resources »