Electromagnetic waves and use of EM waves Flashcards
What type of spectrum do em waves form
A continuous spectrum
Order the types of em radiation from lowest to highest frequency
Radio waves
Microwaves
Infrared
Visible light
Ultraviolet
X rays
Gamma Rays
How do the 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
What property of waves in different mediums chase refraction
Velocity
Wave speed is slower in dense materials cause refraction
In which direction do waves refract when entering a denser medium
They end towards the normal
The angle of refraction is less than the angle of incidence
What types of waves can be produced by oscillations in an electrical current
Radio waves
How can radio waves create an A.C 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
Changes in the nuclei of atoms
What health effects can ultraviolate waves cause
Causes the skin to age prematurely
Can increase the risk of developing skin cancer
What health effects can X rays and Gamma rays cause
They are ionising radiation so can cause mutations in genes
Can lead to increased risk of developing various cancers
Give three uses for infrared radiation
Electrical heating
Cooking food
Infrared camera
Give two uses for microwave radiation
Satellite communications
Cooking food
Give to practical uses for radio waves
Television transmission
Radio transmission
