Electromagnetic waves are patterns of the electric and magnetic energy generated by an oscillation .
the visible light is one form of electromagnetic radiation and the other types of electromagnetic wave share many properties of the light. they travel through space at the speed of lightthey can be reflected diffracted and refracted.
The Strength of the waves varies , with alternating crests and trough.
The distance from trough to crest is called the wavelenght .
The number of waves produced per second is called frequency.
Electromagnetic radiation forms a spectrum that extends from waves of extremely high frequency and short wavelenght to extremely low frequency and long wavelenght
Visible radiation is one form of electromagnetic radiation and the other types of electromagnetic wave share many of the properties of light.
visible light is only a small part of the electromagnetic spectrum.
in order of increasing wavelenghtthe spectrum consist:gamma rays, x rays, ultraviolet rays,, visible light,infrared radiation microwaves radio waves
The wavelenght and frequency of electromagnetic waves are important in determing , their heating effect visibility and other characteristics.
Radio waves are used in radio and television broadcasting. in addition the microwaves use for cooking.
infrared rays given off by hot objects are used in medical treatments .
ultraviolet ray are used in sun lamps and as disinfectant
X ray are used to help to locate and diagnose internal disorders in the body
in the end gamma rays given off by radium, are used to treat cancer.
