Longitudinal Transverse

Electromagnetic Spectrum Wave Transverse Longitudinal Eg. Sound Eg. Light A component of Electromagnetic Spectrum

Electromagnetic Spectrum Light is just a component of the Electromagnetic (EM) Spectrum There are altogether 7 components in the spectrum

7 main components in the EM spectrum Gamma-ray X-ray Ultra-violet Infra-red Micro wave Radio wave Violet Blue Green Yellow Orange Red Indigo

Frequency Frequency = no. of complete wave in 1s Higher Lower Wavelength Wavelength Shorter Longer Gamma-ray X-ray Ultra-violet Infra-red Micro wave Radio wave

Gamma-ray X-ray Ultra-violet Infra-red Micro wave Radio wave

Shortest to Longest wavelength Gamma-ray X-ray Ultraviolet Visible Light Infrared Microwave Radio wave

Properties EM waves are all transverse wave The speed of all the EM wave in vacuum is the same How fast is the speed of light in vacuum? Speed of Light = 3 x 108 m/s Speed of all the EM wave = 3 x 108 m/s

Properties & Application Name Properties Application Gamma-ray Penetrate matter Kill cancer cells X-ray Less penetrating than Gamma-ray Take “pictures” of bones in the body Ultraviolet Given off by the Sun in large quantities Detect counterfeit notes Visible Light The only EM waves visible to our eyes Enables us to see things Infrared Produced by all objects with temperature higher than 0 Kelvin (-273oc) Heating Microwave Generated by extremely high frequency electric current Cooking in microwave Radio wave Generated by high frequency electric current TV & radio broadcasting

Ultraviolet X-Ray

Visible Light Infrared Gamma Ray

Microwave Radio wave

which kind of wave has the highest energy? Conclusion Waves in EM Spectrum are all transverse waves. They travel at the same speed, 3 x 108 m/s, in vacuum Gamma-ray X-ray Ultra-violet Infra-red Micro wave Radio wave which kind of wave has the highest energy?