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Quantum physics , Blackbody Radiation & importance of studying emitted ray from different bodies

From Online Sciences - April 12, 2018

Quantum physics is the physics that allows us to study and explain scientific phenomena which might not be directly observed in our daily life especially when we deal with atomic and subatomic systems such as studying atomic spectrum and electronic phenomena on the level of the molecule such as studying chemical reactions .

Quantum physics

The classical physics explains everything in our daily life and our common experiences , but there is another branch which deals with a great collection of scientific phenomena which might not be directly observed in our daily life .

Quantum physics explains all phenomena involved in electronics which is the basic for all the modern electronic and communication systems .

Quantum physics explains the chemical reactions on the level of the molecule which were photographed by Ahmed Zewail using a high speed laser camera and such work entitled him to be awarded the Nobel Prize in Chemistry in 1999 .

Quantum physics deals with a number of situations in the universe which classical physics can not explain , especially when we deal with atomic and subatomic systems down to the subatomic scale .

Classical physics is the physics that allows us to interpret the daily observations and common experiences such as studying waves as sound , light , heat and electricity with their properties .

There are different types of electromagnetic waves which may differ in frequency and wavelengths , The light is one of the types of the electromagnetic waves and posses the common features of waves such as :

Blackbody radiation

The blackbody is a body which does not exist in nature but it can be likened as enclosed cavity which has a small hole , the inside of the cavity appears black because all of the radiation within the cavity remains trapped due to multiple reflections and the larger part of the radiation is absorbed while only a small part of it leaks out which is calledBlackbody radiations.

Blackbody is a body absorbs all the radiations with different wavelengths which fall on it ( perfect absorber ) and emits these radiations wholly ( perfect emitter ) .

Glowing bodies and non glowing bodies

The bodies that emit light heat are called hot bodies while the bodies which absorb the radiations and remit them are called non glowing bodies such as the Earth , Examples of glowing bodies such as Lamp filament , Burning a piece of coal , Sun and stars .

Glowing bodies are bodies which emit light and heat radiations such as the Sun , Non glowing bodies are bodies which absorb the radiation and remit them such as the Earth .

The light emitted from each source of the glowing sources ( Sun , stars , a burning of charcoal and glowing incandescent lamp ) , light varies by varying the temperature , Because the glowing sources do not emit all the wavelengths equally , but the intensity of radiations varies with wavelength and the wavelength which has the maximum radiation depends on the temperature of the source .

Relation between the intensity of radiations and the wavelength ( Planks distribution )

Planck manged to explain the relation between the intensity of radiations and the wavelength by studying the emitted radiation from different sources , The graphical curve representing this relation is called Plancks curve .

Plancks interpretation ( year 1900 ) for the blackbody radiation
Importance of studying the emitted ray from different bodies

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