Waves and Vibrations
- Created by: JC:A-A-B
- Created on: 22-12-18 08:54
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- Waves and Vibrations By Jenisha Rajput
- Types of Waves
- Mechanical Waves
- Waves pass through a substance
- Sound waves, Seismic waves, waves on string
- Waves pass through a substance
- Electromagnetic Waves
- Oscillating electric & magnetic fields without substance.
- Examples inc. Electromagnetic spectrum
- Oscillating electric & magnetic fields without substance.
- Mechanical Waves
- Longitudinal Waves
- Direction of vibration of particles is parallel to direction waves travels.
- Sound waves, primary seismic waves, compression waves on slinky.
- Forward movement - compression wave- coils push into each other. Reverse movement - coils move apart- rarefaction (expansion.
- Sound waves, primary seismic waves, compression waves on slinky.
- Direction of vibration of particles is parallel to direction waves travels.
- Transverse Waves
- Direction of vibration perpendicular to direction wave travels.
- Electromagnetic Waves, secondary seismic waves, on string/ wire.
- End of rope- move side to side - sideways movements, each unaffected part of rope pulled sideways when part next to it moves sideways.
- Electromagnetic Waves, secondary seismic waves, on string/ wire.
- Direction of vibration perpendicular to direction wave travels.
- Polarisation
- Transverse- plane-polarised.- in one plane only.- if changed - unpolarised.
- Unpolarised wave travels on rope- pass through slit- polarised - only vibrations parallel to slit pass through.
- Light from filament lamp/ candle- unpolarised. Filter only allows light through which vibrates in certain direction- alignment of its molecules.
- Unpolarised light through 2 filters, transmitted light intensity changes if 1 polaroid is turned proportional to other.- filters cross when intensity is minimum - polarised light from 1st filter can't pass 2nd, alignment of molecules 90 degrees to 1st.
- Plane polarisation of an electromagnetic wave= plane in which electric field oscillates.
- Polaroid sunglasses reduce glare of light reflected by water/ glass. Reflected light polarised & intensity reduced - passes through ppolariod
- Light from filament lamp/ candle- unpolarised. Filter only allows light through which vibrates in certain direction- alignment of its molecules.
- Unpolarised wave travels on rope- pass through slit- polarised - only vibrations parallel to slit pass through.
- Transverse- plane-polarised.- in one plane only.- if changed - unpolarised.
- Types of Waves
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