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13008905
Electromagnetic Waves
Descripción
7 Science Mapa Mental sobre Electromagnetic Waves, creado por Aafreen Butt el 26/03/2018.
Sin etiquetas
electromagneticwaves
electromagnetic
waves
radiowaves
microwaves
infrared
visiblelight
xrays
gammarays
gamma
visible
science
7
Mapa Mental por
Aafreen Butt
, actualizado hace más de 1 año
Más
Menos
Creado por
Aafreen Butt
hace más de 6 años
11
0
0
Resumen del Recurso
Electromagnetic Waves
Micro Waves
Uses: cooking, mobile phones, communications and satellite transmissions (radar)
Produced by oscillating electrons in metals
Strongly absorbed by water
They make molecules of water vibrate which leads to heat
Microwaves start heating internally
Produced and received by aerials
Infra Red
Uses: heating, grills, toasters, remote controls, cable TV, heat treatment and security systems
Heat is caused by vibrating atoms and molecules
Given out by all objects that have a temperature
Can be detected by skin, thermal cameras and thermometers
Starts heating from the surface
Dark objects emit and absorb more infra-red than white objects
Visible Light
Uses: to see, for illumination in torches or lightbulbs, photography and lasers
Produced by atoms when electrons change energy levels
When an atom absorbs light, an electron moves to a higher energy level
The more levels they jump the higher the frequency
Ultra Violet
Uses: security markers, fluorescent lamps, washing powder, sunbeds and for disinfecting water
Produced when electrons change energy levels
You can absorb UV but get visible light (fluorescence)
Can ionise atoms and molecules
Damages skin and eye cells
Makes you blind or gives you skin cancer in large doses
Small doses are good
X Rays
Source: x-ray tubes
Can be detected by photographic film
Uses: observing internal structure, people, metal structure, airport security and archeology
Absorbed by bone but transmits or passes through air, skin or soft tissue
CT scans are more dangerous because they come in a higher dosage
Produced by accelerating electrons
Can cause ionisation and kill or damage our cells
Alters and damages our DNA cells which causes mutation
Gamma Rays
Source: radioactive substances like uranium
Made when there is a change in the nucleus of the radioactive substance
Detected by Geiger-muller tube
Uses; getting rid of bacteria, sterilise surgical equipment, detect and treat cancer
Used in radiotherapy
Partially absorbed by thick lead and concrete
Detected by photographic film
Dangerous because it kills and/or mutates cells
Radio Waves
Used: TV, Radio, Communications, Bluetooth, Satellite transmissions (radar)
produced by oscillating electrons in metals
Causes electrons in metals to oscillate, making an electrical current or voltage
Atoms, electrons or molecules vibrating leads to heat
Causes metals to heat up
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