Energy in Our LifeEnergy in Our Life

Miroslav HruškaMiroslav Hruška

Czech Republic

Our schoolOur school

Electromagnetic radiationElectromagnetic radiation

…is a form of ENERGY

Forms of E-M radiationForms of E-M radiation

radio waves microwaves infrared radiation visible radiation (light) ultraviolet radiation X-rays gamma rays

Electromagnetic wavesElectromagnetic waves

wavelength - in metresfrequency - in hertz

Wave formulaWave formulawave speed =

= frequency x wavelength

c = 300,000,000 m/s

the higher frequencythe lower wavelength

DifferencesDifferences

in sourcesin penetrabilityin impact on peoplein use

Radio wavesRadio waves

Microwaves - ovenMicrowaves - oven

Microwaves - communicationMicrowaves - communication

Microwaves - radarMicrowaves - radar

Thermal radiationThermal radiation

infrared radiation visible radiation = lightultraviolet radiation

Thermal radiationThermal radiation - sources - sources

Sun and other starslight bulb hot oven infrared heater melting iron hot lava

Thermal radiationThermal radiation formula formula

The hotter a body is,

the shorter wavelengths it emits,

and the more energy it looses.

Infrared radiationInfrared radiation - use - use

thermography night visioninfrared heatingremote control

Infrared radiation - thermographyInfrared radiation - thermography

Infrared radiation – night visionInfrared radiation – night vision

Infrared Infrared heatingheating

Infrared Infrared photographyphotography

LightLight

from 390 nm to 790 nm

Light spectrumLight spectrumprism spectrum

Light - spectroscopyLight - spectroscopy

spectral analysis => chemical composition

LaserLaser

Light

Amplification by

Stimulated

Emission of

Radiation

LaserLaser – optical recording – optical recording

CD red laser 780 nm

DVD red-orange 650 nm

Blu-ray “blue” (violet) 405 nm

UV radiationUV radiation

UVA 315-390 nm UVB 280-315 nm UVC 100-280 nm

UV radiationUV radiation

UV radiationUV radiation

X-X-raysrays

X-X-raysrays

Gamma raysGamma rays

Gamma raysGamma rays

Gamma rays – in medicineGamma rays – in medicine

Thank you!Thank you!

Electromagnetic radiationElectromagnetic radiation

© Miroslav Hruška, 2012