Flashcards
revision
Cards in this deck (29)
- 1waves transfer ______ without transferring _____.Waves transfer energy without transferring matter.
- 2Define waves.vibrations which transfer energy from place to place without matter being transferred.
- 3Define electromagnetic waveselectric and magnetic disturbances that can be used to transfer energy from a source to an absorber. They do not need a medium.
- 4define mechanical wavesvibrations which require a medium
- 5Give examples of mechanical and electromagnetic waveselectro: microwaves, radio waves, light
mechanical: sound, water, spring/ropes, seismic - 6what are transverse waves?waves with oscillations perpendicular to direction of travel. ALL ELECTROMAGNETIC WAVES ARE TRANSVERSE.
- 7define longitudinal waveswaves with oscillations perpendicular to energy transfer
- 8what is a rarefactionwhen particles of a wave are spread out
- 9what is a compressionwhen particles are close together
- 10give an example of a transverse and longitudinal wavetransverse: all electromagnetic waves
longitudinal: sound - 11define amplitudethe maximum displacement of a point on a wave from its undisturbed position
- 12the bigger the amplitude....The MORE ENERGY the waves carry.
- 13define wavelengththe distance of a point on a wave to the equivalent point on an adjacent wave.
- 14define frequencythe number of waves passing a certain point each second
- 15define time periodthe time taken for each wave to pass a fixed point
- 16formula for time periodperiod = 1/frequency
- 17wave speedthe distance travelled by each wave every second through a medium
- 18wave speed =frequency x wavelength
- 19define reflectionwhen waves "bounce" off a surface
- 20what is the law of refractionangle of incidence = angle of reflection
- 21define refractionthe change in direction or speed when waves travel through a boundary between two different mediums. This is because the wave speed and length change
- 22at a boundary between two different mediums, waves can be...TRANSMITTED or ABSORBED.
- 23what happens when waves are absorbedthe amplitude slowly decreases as the substance absorbs the wave's energy
- 24define sound wavesvibrations in waves of compressions and rarefactions that travel through a medium.
- 25sound waves are longitudinal because...oscillations are parallel to direction of energy transfer. the speed of sound is 330m/s
- 26How do loud speakers workthey concert electric energy to kinetic energy - they make sound by pushing surroudning air backwards and forwards
- 27how can you prove that sound needs a medium?Put a ringing bell in a jar. As air is pumped out, the noise will become quieter and quieter, and eventually silent as all air is pumped out
- 28define echothe sound caused by the relfection of sound waves from the surface back to the listener.
- 29sound waves reflect from _____, _______ surfaces.smooth and hard.
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- Flashcards on revision , created by Aaishah Din on 20/05/2018.
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- Aaishah Din
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