Fundamentals of electromagnetic spectrum (What is electromagnetic waves?…
Fundamentals of electromagnetic spectrum
Maxwell's wave theory
Speed of light,c is the product of wavelength,λ and frequency of
wavelength and frequency inversely proportional to each other as speed of light is constant
Planck's quantum theory
The energy of a quantum,Q is defined as the product of the Planck's constant,h and frequency of the wave,f.
Combination of Maxwell's theory and Planck's theory :
Q=hc/λ , f=c/λ
What is electromagnetic waves?
Waves created as a result of vibrations between an electric field and magnetic field
They are formed when electric field comes in contact with magnetic field
The electric field and magnetic field of the electromagnetic wave are perpendicular to each other and the direction of propagation of the wave is perpendicular to these fields.
Magnetic field vibrates horizontally while electric field vibrates vertically
gamma, X-ray, ultraviolet, visible,infrared, microwave and radiowave ( increasing wavelength with decreasing frequency)
Properties of all electromagnetic wave
Electromagnetic radiation can travel through empty space
Wavelengths are measured between the distances of either crests or troughs. It is usually characterized by the Greek symbol λ
The speed of light is always a constant.
Characteristics of electromagnetic waves
in a vacuum is approximately 186,000 miles per second or 300,000 kilometers per second
The wavelengths determine how matter responds to the electromagnetic wave, and those characteristics determine the name we give that particular group of wavelengths.
relates to its intensity or brightness
Frequency is directly proportional to energy