Physics- P1.5
- Created by: LaurenEvansx
- Created on: 08-08-16 13:20
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P1.5&6
Waves
- Waves have energy.
- Particles on the surface of the wave go up and down.
- Waves transfer energy.
Mechanical Waves
- Vibrations that travel through a medium (substance)
- Examples:
- Sound waves
- Water waves
- Waves on springs/ ropes
- Seismic waves from earthquakes
Electromagnetic Waves
- These waves travel through a vacuum atb the sane speed.
- Examples:
- Light waves
- Radio Waves
- Microwaves
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.
Wave Characteristics
- 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
- Upright
- 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
- 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
- Refraction of light in the bending of light rays at the interface…
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