Waves- Electromagentic Waves Flashcards
What type of spectrum do electromagnetic waves form?
A continuous spectrum
Order the types of electromagnetic radiation from lowest to highest frequency?
Radio waves
Microwaves
Infared
Visible light
Ultraviolet
X-rays
Gamma rays
How do speeds of em radiation differ in a vacuum and in air?
Em waves all travel at the same speed in a vacuum and in air
In which direction do waves refract when entering a denser medium?
The bend towards the normal
The angle of rarefaction is less than the angle of incidence
What type of waves can be produced by oscillations in an electrical circuit?
Radio waves
How can radio waves create an alternating current in a circuit?
When radio waves are absorbed they can induce oscillations in a circuit with the same frequency as the waves themselves
Where do gamma rays originate from?
From the changes in the nuclei of an atom
What health risks can ultraviolet waves cause?
Cause the skin to age prematurely
They can increase the risk of developing skin cancer
What health risks can x rays and gamma rays cause?
They are ionising radiation so can cause mutations in genes
They can lead to increased risk of developing various cancers
Give three practical uses for infrared radiation?
Electrical heaters
Cooking food
Infrared cameras
Give two practical uses for microwave radiation?
Satellite communications
Cooking food
Give two practical uses for radio waves?
Television transmission
Radio transmission
