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electromagnetic spectrum
Electromagnetic spectrum
40
Physics
11/05/2008

Term
 Wavelength
Definition
 ~The distance from one peak to the next.
Term
 Frequency
Definition
 ~How many complete waves there are per second. Measured in hertz (Hz) (1Hz = 1 wave per second)
Term
 Amplitude
Definition
 ~Height of the wave
Term
 Speed
Definition
 ~How fast it is
Term
Definition
 ~1m - 10(superscript)4 m~km
Term
 Micro waves wavelength
Definition
 ~10(superscript)-2 m~cm
Term
 Infra Red wavelength
Definition
 ~10(superscript)-5 m
Term
 Visible Light wavelength
Definition
 ~10(superscript)-7 m
Term
 Ultra violet wavelength
Definition
 ~10(superscript)-8 m
Term
 X-rays wavelength
Definition
 ~10(superscript)-10 m
Term
 Gamma rays wavelength
Definition
 ~ 10(superscript)-12 m
Term
 A high frequency means a _________.
Definition
 ~lower wavelength
Term
 Wave Speed = ______ * _____
Definition
 ~Frequency * wavelength
Term
 Transmitted
Definition
 ~Just passes through the substance
Term
 Reflected
Definition
 ~Bounces back
Term
 Absorbed
Definition
 ~The wave's energy is transferred to the matter
Term
 What happens (i.e absorption/reflection) depends on: [two things]
Definition
 ~The surface of the substance~The wavelength of the radiation
Term
 If EM radication is absorbed it could either: [two things]
Definition
 ~Make the substance hot~Set up a tiny alternating current with the same frequency as the EM wave
Term
 A wave that is mostly transmitted
Definition
Term
 A wave that is absorbed and causes heating of the cells
Definition
 ~Micro waves
Term
 A wave that causes skin cancer
Definition
Term
Definition
 ~When the radiation destroys the cells
Term
 What does the effect of the radiation depend upon? [two things]
Definition
Term
Definition
 ~radio therapy, diagnastic work with gamma camera, pipe leakage~Cancer and mutation deep in the body
Term
 X-rays uses and dangers
Definition
 ~Medical scanning for broken bones and tumours in tissue~Cancer and mutations deep in the body
Term
 Ultra Violet uses and dangers
Definition
 ~Security marking, insect capture~Skin cancer and cateracts
Term
 Visible Light uses and dangers
Definition
 ~Communication, warnings of danger and location, writing, painting etc.~Very birght light can damage the retina
Term
 Micro waves uses and dangers
Definition
 ~Satellite communication and cooking~Heating effects within tissue, it is ionizing, scientists think it can cause tumour growth.
Term
 Micro waves uses and dangers
Definition
 ~Satellite communication and cooking~Heating effects within tissue, it is ionizing, scientists think it can cause tumour growth.
Term
 Radio and TV waves uses and dangers
Definition
 ~Communication~None known unless intensity is abnormally high
Term
 All EM waves travel at _____ through a vacuum.
Definition
 ~300 million m/s
Term
 tera (T)
Definition
 x10(superscript)12 m
Term
 giga (G)
Definition
 x10(superscript)9 m
Term
 mega (M)
Definition
 x10(superscript)6 m
Term
 kilo(K)
Definition
 x10(superscript)3 m
Term
 centi(c)
Definition
 x10(superscript)-2 m
Term
 milli (m)
Definition
 x10(superscript)-3 m
Term
 micro
Definition
 x10(superscript)-6 m
Term
 nano (n)
Definition
 x10(superscript)-9 m
Term
 pico (p)
Definition
 x10(superscript)-12 m
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