P13: Electromagnetic Waves Flashcards
What type of waves are electromagnetic waves?
Transverse
How does the velocity differ depending on the type of electromagnetic wave?
They don’t; the velocity is always the same
How are the electromagnetic waves ordered in terms of wavelength and frequency?
They go from long to short wavelength and from low to high frequency
How are radio waves produced?
By oscillations in electrical circuits
What happens when radio waves are absorbed?
They may create an alternating current with the same frequency as the radio wave itself.
What 3 electromagnetic waves can have hazardous affects on the human body?
Ultraviolet waves, X-rays and gamma rays
What can ultraviolet waves cause?
Skin to age prematurely and an increased risk of skin cancer
What can x-rays and gamma rays cause?
Mutations of genes as well as cancer
Where can radio waves be found?
Televisions and radios
What electromagnetic wave is found in satellite communications and cooking food?
Microwaves
Where can infrared be found?
Electrical heaters and infrared cameras, or any wired or wireless connections
What electromagnetic wave is found in fibre optic communications?
Visible light
Where can ultraviolet waves be found?
Energy efficient lamps and sun tanning
What electromagnetic wave(s) is found in medical imaging and treatment?
X-rays and gamma rays
When does the image in an x-ray go black?
If the detector plate receives radiation
