Year 9 (Electromagnetic Scale) Flashcards
Order of Waves (Longest to Shortest)
- radio waves
- microwaves
- infrared
- visible light
- ultra violet
- rays
- gamma rays
Uses of Radio Waves
Television signals
Uses of microwaves
Cooking
Uses of infrared
Fibre communication
Uses of visible light
Seeing
Uses of ultraviolet
Tanning beds
Uses of x-rays
Images of bones
Uses of gamma rays
Killing cancer cells
Relative size of radio waves
Football pitch
Relative size of micro waves
Butterfly
Relative size of infrared
Bacteria
Relative size of visible light
Virus
Relative size of ultraviolet
Molecules
Relative size of x-rays
Atoms
Relative size of gamma rays
Atomic nucleas
What are transverse waves
- vibrations perpendicular to the transferred energy
- oscillations and vibrations are at right angle to the travel
What are longitudinal waves
- vibrations parallel to the energy being transferred
Label a transverse wave
See book for answer
Label a longitudinal wave
See book for answer
What are mechanical waves
Waves which pass through a material are vibrations of that materials
What are EM waves
Vibrating electricity or magnetic fields through space
What are seismic waves
Waves which travel through the upper crust and tectonic movement (cause earthquakes)
How to work out a ‘period’ (T)
1 / frequency
How to workout ‘wave speed’ (m/s)
Frequency (Hz) x wavelength (M)
Wave properties (Reflection) and draw
- waves will bounce off a surface under certain conditions as the surface must be shiny for electromagnetic waves
Wave properties (refraction) and draw
- when waves cross a medium or less or more dense surfaces causing a change in speed and wavelength (slows in denser material)
Wave properties (diffraction) and draw
- when waves pass through a gap that is roughly the same size or smaller than the wavelength
- larger gap (curves at the edges of the wave)
- small gap (waves fan out in the circle)
