Waves Flashcards
Transverse waves
Particles move/ vibrate perpendicular to the transfer of energy
Longitudinal waves
Particles move/vibrate parallel to the transfer of energy
Examples of transverse waves
Ocean waves, All EMS waves, S waves
Examples of longitudinal waves
Sound, P-waves
Label a transverse wave
Peak, trough, amplitude, wavelength, frequency
Label a longitudinal wave
Compression, rarefaction, wavelength, frequency
What is frequency & its equation
Number of waves per second
1/period(time)
When will an objects temperature increase (radiation)
If it absorbs more infra-red than it gives out
What is the definition of a perfect black body
Something that absorbs and emits all wavelengths of radiation
What is the speed of light
300,000,000 m/s
Similarities between all EM waves
Transverse
Reflected
Refracted
Polarised
What does it mean if a wave is polarised
It’s vibrations are confined to single plane
Dangers of All EMS
Radio- None
Microwaves- Cause water to vibrate- damage brain
Infra-Red- Cause us to be too hot
Visible- Blind us if too much
Ultra-violet- Ionising cancer
X-rays- Ionising cancer
Gamma- Ionising cancer
Uses of all EMS
Radio- TV and Radio
Microwaves- Heat up food, satellite communication
Infra-Red Remote controls, cooking food
Visible- To see, fibre optics
Ultra violet- Scans, to get tanned
X-rays Medical Imaging
Gamma Treatments
Which states of matter does sound travel the fastest and slowest in
Fastest in solids, slower in gases