Electromagnetic Spectrum 1 Flashcards
What are electromagnetic waves
Electric and magnetic disturbances
Do all electromagnetic waves travel at the same speed
Yes
What is the electromagnetic spectrum in order
Radio waves
Microwaves
Infrared
Visible
Uv
X ray
Gamma ray
What does the higher the frequency mean to an electromagnetic spectrum
The more energy it transfers
Which part of the electromagnetic spectrum has the longest wavelength
The top
Which part of the electromagnetic spectrum transfers the most energy
The bottom
What is a mnemonic to help you remember the order of the spectrum
Rude medics inject verrucas using xenon gas
What is white light
Light that contains all the colours of the visible spectrum
What is infrared radiation emitted by
Everything
What uses infrared radiation
TVs and DVDs
What are microwaves used for
Send signals to and from satellites for tv programmes
What can too much of radio waves micro waves and infrared radiation cause
Internal heating and burning
What are carrier waves
Waves that are used to carry any type of signal
Which type of wave are carried by optical fibres
Visible and infrared
What are uv waves used for
Security marking and in sunbeds
What can uv waves cause
Skin cancer and may be harmful to eyes
What are x rays used for
Images of bones
Killing tumours
What are gamma rays used for
Kill harmful bacteria and sterilise surgical instruments
What is ionisation
When gamma or x rays pass through a substance They knock electrons out of the substance leaving the atoms with a positive charge
What absorb gamma and x rays
Lead
what is a film badge used for
changes colour if exposed to x ray so can be monitored
what can radio waves do
bend around large objects
how are carrier waves used to transfer information
in a radio station, a microphone produces an audio signal when sound waves reach it
the audio signal varies the frequency of the carrier waves
they are emitted by a transmitter aerial
a receiver aerial picks it up and creates an alternating current with the same frequency
