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Electromagnetic waves by Mind Map: Electromagnetic waves
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Electromagnetic waves

Electromagnetic spectrum

consist of EM waves of continuous range of frequencies.

visible light spectrum forms part of electromagnetic spectrum

Task 1

Task 2

no fixed boundaries in frequencies of each group of electromagnetic waves

Call 1

Call 2

high frequency leads to

low wavelength

greater amount of energy carried by the EM wave

Properties

transverse wave

Task 1

Task 2

does not require medium to propagate

Call 1

Call 2

travel at a speed of 3.0 x 10^8 m/s

obey general wave equation where c is the light speed

speed of light = wavelength / period

speed of light = frequency x wavelength

obey laws of reflection and refraction

Radiation

caused by EM waves such as UV, X, gamma rays

caused due to ionization radiation of waves

electron gain energy and escapes from the atoms

consequences

cancer

genetic mutations

damage genes and DNA

Premature Aging

Components

Radio Waves

lowest frequency and longest wavelength

used for radio and TV broadcasting

heat up food due to friction and collision between rotating water molecule.

lowest frequency radio waves are reflected from an electrically charged layer of the upper atmosphere, called ionosphere

can reach receivers not in sight due to curvature of earth surface. eg. remote control cars and walkie talkie

Microwaves

refer to radio waves with short wavelengths

transmit great quantities of data due to higher frequencies.

repeater are used to receive, convert and transmit information over large distances.

eg. Microwave oven, satelite, radar and mobile phones

Infrared

causes molecules to resonate and vibrate

sun emits half of its radiation thru infrared and light bulbs emit infrared more than light.

eg. remote controls, night vision goggles, thermal imaging to detect virus such as SARS and H1N1

Visible Light

only range of frequencies visible to human eye produced by luminous objects

red light at low frequencies and violet light at high frequencies

colour of light is dependent on frequencies and wavelength

eg. optical fibres, light photography, endoscopy

Ultra- Violet

from the sun

stimulate production of melanin, kills bacteria and creates ultraviolet watermark on banknotes

X- rays

high frequencies and high penetrating capabilities thru objects

hazardous

high frequency and energy

eg. X ray medical imaging, airport security imaging

Gamma Rays

highest frequency and penetrating

emitted from radioactive decay of unstable atoms and isotopes

kill cancerous cells but also healthy cells

medical tools are sterilized with gamma rays