Ch 11 Electromagnetic Wave# Flashcards
All electromagnetic waves are ________________ waves.
transverse
What is the speed of light in vacuum?
3x10^8 m/s
How are the electromagnetic waves arranged?
In order of increasing or decreasing wavelength or
in order of increasing or decreasing frequency
Which wave has the longest wavelength?
radiowave
Which wave has the highest frequency?
gamma ray
which wave has the lowest frequency?
radiowaves
State all 7 components of the electromagnetic spectrum in increasing order of wavelength.
In this order:
gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves and radio waves.
What are ionising waves?
They are waves with higher frequencies and thus have higher energy.
They are called ionising waves as they eject electrons from atoms and molecules to produce ions.
State one application of radio waves.
radio and television communication to transmit sound and pictures
State one application of microwaves.
satellite communication, mobile phone network, cooking food in a microwave oven, GPS, cancer treatment.
This list is not exhaustive.
State one application of infra-red.
used in thermal imaging cameras, surveillance system to detect intruders, transmit information in remote controls.
State one application of visible light.
used in lasers to cut through hard materials or weld metals together, allows humans to see, photography, artificial light for plant growth
State one application of ultraviolet rays.
stimulates the body to produce vitamin D, sterilise surgical equipment, used in anti-forgery in currencies
State one application of X-rays.
used to examine hidden flaws and cracks in metal welding, inspection of luggage in airports, examine the condition of a person’s bones
State one application of gamma rays.
used to kill cancerous cells, sterilise hospital equipment, check flaws in metal
