Examples and some technological applications of electromagnetic waves .
The electromagnetic waves
The electromagnetic waves are formed when an electric field couples with a magnetic field . The magnetic and electric fields of an electromagnetic waves are perpendicular to each other and to the direction of the wave .
Electromagnetic waves are characterized by :
They are accompanied with the electromagnetic forces .
Their speed is extremely high ( speed of the light is about 300 millions m/s ) .
No medium is required for the electromagnetic waves to travel through , They can travel through the free space .
Examples of electromagnetic waves :
Wireless waves . ( which are used in communications )
X – rays .
Ultraviolet and infrared rays ( accompanied by Sun rays ) .
Radio and television waves .
Technological applications of electromagnetic waves .
Ultraviolet ( UV ) rays : They have the property of killing the microbes , so , they are used to sterilize the sets of surgical operations rooms .
X – rays : They are very important In photographing the bones for detecting the bone fractures , X – rays are used in examining the mineral raws in industry and showing errors , pores and cracks in these minerals ?
Gamma rays : They are used in medical purposes as the treatment and discovering of some swellings ( tumors ) .
Visible ( seen ) light : They are used In photographing cameras , They are very important in television cameras , They are used in light shows ( data show ) .
Infrared ( IR ) rays : They are used in night vision apparatus used by modern military forces ,They are very important in remote sensing instrument to photograph Earth’s surface using the satellites .
Also they are used in cooking food because these rays have heat effect property and they are used in making remote sets to control and start electric sets ( TV , DVD , air conditioner …. ) .