- Waves have energy.
- Particles on the surface of the wave go up and down.
- Waves transfer energy.
- Vibrations that travel through a medium (substance)
- Sound waves
- Water waves
- Waves on springs/ ropes
- Seismic waves from earthquakes
- These waves travel through a vacuum atb the sane speed.
- Light waves
- Radio Waves
Longitudianal Waves- The direction of the vibration or oscillation is parallel to the direction of energy transfer (the direction in which the wave travels) e.g. sound.
Transverse Waves- The direction of vibration or oscillation of is perpendicular to the direction of energy transfer (direction in which the wave travels) e.g. water.
- Wavelength- Top of one peak to the other- bottom of trough to another.
- Amplitude- Distance from baseline to peak or baseline to trough.
- Frequency- N.o of waves per second if one wave passes in one second it has a frequency of one Hertz or Hz. This is the unit for frequency.
LIGHT TRAVELS IN STRAIGHT LINES
Image in a plane mirror
- Same size as the object
- Distance from mirroe to image= distance from images to mirror
- Laterally inverted (flipped around)
- Virtual- can't be shown on a screen. (The image is called virtual because the light rays never really go there- our brains just think the do).
- Diffraction is the bending of waves round an obstacle or through a hole. The spreading out of waves.
- Maximum diffraction occurs when the wavelength is similar to the gap size.
- Refraction of light in the bending of light rays at the interface…