Question

Particle nature of electromagnetic radiation planck's quantum theory

Answer 1

Answer :

Particle Nature of Electromagnetic Radiation :

• The radiations emitted by hot objects are over a wide range of wavelengths.
• The instensities of radiations of different wavelengths depend on the temperature of the body.
• An ideal body, which emits and absorbs radiations of all frequencies uniformly, is called the black body.
• The radiations emitted by the black body is called black body radiation.
• A black body is a perfect radiator.
• A black body radiates some amount of energy per unit area as it absorbs from its surrounding in any given time.
• Temperature increase, increases the intensity of radiations along with the wavelength.
• Further, after reaching the maximum value, it starts decreasing.

Planck's Quantum Theory -

• It was introduced by Max Planck.
• He assumed that the emission and absorption of radiations occur from atoms in the wall of black body, that is, oscillator.
• He also assumed that the radiations can be sub divided into chunks of energy.
• According to him, that the atoms and molecules emitter absorb energy in discrete quantities and not in continuous manner.
• The smallest quantity of energy that can be emitted or absorbed in electromagnetic radiation form was called as quantum by Max Planck.
• The energy of a quantum of radiation (E) is proportional to its frequency (v), and it is expressed as : E = hv.
• "h" is a proportionality constant called the Planck's constant.
• The value of h = 6.626 × 10^{-34} Js.
• He explained the distribution of intensity in the radiation from black body as function of frequency of wavelength at different temperatures.
• He also explained quantization as a staircase. The energy can take any values from the set given by him, bu can not be in between of those values. The set is : E = 0, hv, 2hv, 3hv....nhv.

Answer 2

According to Planck's quantum theory, Different atoms and molecules can emit or absorb energy in discrete quantities only. The smallest amount of energy that can be emitted or absorbed in the form of electromagnetic radiation is known as quantum.

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Answer 3

According to Planck's quantum theory, Different atoms and molecules can emit or absorb energy in discrete quantities only. The smallest amount of energy that can be emitted or absorbed in the form of electromagnetic radiation is known as quantum.

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