Waves
- Created by: Samuel1746
- Created on: 11-04-15 12:30
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- Waves
- Wave Properties: Refraction
- Refraction is the change of direction in light due to it passing through a median of different density
- The light ray changes direction towards the normal meaning the angle of refraction (r) is smaller than the angle of incidence (i)
- When exiting the median, r is greater than i
- Measuring Waves
- The amplitude of a wave is the distance between any trough or peak and the middle of the wave
- The wavelength is the distance from peak to peak or from trough to trough
- Wave Speed: Wave speed = frequency x wavelength
- The Nature of Waves
- There are two types of wave:
- Mechanical Waves: These include sound waves, water waves and seismic waves
- These waves are vibrations and require a median to pass through
- Sound waves are longitudinal meaning that the vibrations are parallel to the direction in which the wave is travelling
- Electromagnetic waves: These incleds light waves, radio waves and microwaves
- All these waves travel at roughly 300,000,000 metres a second and do not require a median to pass through
- All electromagnetic waves are transverse waves meaning the vibrations are perpendicular to the direction in which te wave is transferring energy
- Mechanical Waves: These include sound waves, water waves and seismic waves
- There are two types of wave:
- Wave Properties: Diffraction
- Diffraction is the spreading of waves when passing through a small gap or past an obstacle
- The smaller the gap, the more the waves spread out
- Wave Properties: Reflection
- The line perpendicular to the reflection pane is the Normal
- The angle of incidence is the angle between the incident ray and the normal
- The angle of reflection is the angle between the reflected ray and the normal
- The incident ray is the ray of light that will be reflected
- Angle of incidence = angle of reflection
- Sound
- Sound waves are just vibrations of particles
- An object vibrating in air will make the layers of air near it vibrate, they will make other layers of air vibrate and so on and so on
- Sound cannot pass through a vacuum
- Increasing the loudness of a sound increases the amplitude of the wave
- Increasing the frequency of the sound increases its pitch
- Sound waves are just vibrations of particles
- Wave Properties: Refraction
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