Invisible Waves Flashcards
Transverse waves
In a transverse wave, the particles of the medium oscillate perpendicular to the direction of the movement of energy. E.g water waves created on the surface of a lake.
Longitudinal (compressional) waves
In a longitudinal wave, the particles of the medium oscillate in a direction which is parallel to the direction of movement of energy (propagation). E.g slinky spring.
Wavelength
The distance between corresponding points on successive waves. Crest to crest or trough to trough.
Amplitude
The distance between the rest position to the top of the crest, or the bottom of a trough.
Frequency
The number of complete waves to pass a point each second. Hertz (Hz)
Period
The time taken for one complete wave to pass. Seconds (s)
Medium
Material trough which a wave passes
Propagate
To produce or form a wave
Electromagnetic Radiation
Energy that is transmitted in the form of electromagnetic waves. EMR is produced by oscillating (vibrating) electrons.
What can EMR be produced by?
- stars (whole EM spectrum)
- radio transmitters (radio waves)
- artificial lights (visible and infra-red radiation)
What is the relationship between the frequency of the radiation and the wavelength?
The higher the frequency, the shorter the wavelength.
What is the relationship between the frequency of the radiation and the intensity of the energy transmitted?
The higher the frequency radiation, the higher the energy intensity transmitted.
What type of radiation transmits the most energy?
Gamma rays.
What type of radiation transmits the least energy?
Radio waves.
Waves
The transfer energy from one place to another, via oscillations, without transferring matter.
