Electromagnetic Spectrum, Waves Flashcards
Electromagnetic waves all travel at the same…….in free space
Speed
What speed do traverse waves travel at
Speed of light
What can electromagnetic waves travel through
a vacuum
Electromagnetic waves have different…….and………
Wave lengths and frequencies
Give the order for the electromagnetic spectrum
Radio waves Microwaves Infrared Radiation Visible light Ultra-violet Xrays Gamma rays
What does the electromagnetic spectrum go up in decreasing….
Wave lengths
Give a use for Radio waves
broadcasting and telecommunications
Give a use for microwaves
longitudinal and satellite transmission
Give a use for Visible light
Optical fibres and daylight
Give a use for Ultra violet light
Hidden messages, crime prevention
Give a use for X rays
Observing the internal structures of objects and materials
Give a use for Gamma rays
sterilising food and hospital equipment
Give a danger for Microwaves
Internal heating of body tissue
Give a danger for Infra-red radiation
Skin burns
Give a danger for Ultra violet light
Damage to surface skin cells, (cancer), and blindness
Give a danger for Gamma rays
Cancer, genetic mutation
In traverse waves each point of the wave is moving …….to the direction in which the ….. of the wave is moving
Perpendicular
Energy
Give a transverse wave that is not part of the electromagnetic spectrum
Mexican waves
In longitudinal waves the energy travels….. to the direction of travel
Parallel
Give the relationship between speed, frequency and wave length of a wave.
Speed = Wavelength x Frequency
Give the relationship between frequency and time of a wave.
Frequency = 1 ÷ time
Give an example of a longitudinal wave
Sound waves
What is frequency measured in
Hertz (KHz)
Define Frequency
The number of waves per second
Define the time period
The time it takes one complete wave to pass, (in seconds)
What are the areas called in a longitudinal wave where the waves are most spread out
Rarefactions
