Question
Write a short note on quantum theory of radiation.
✓
Answer
$i.$ Max Planck put forward a theory known as Planck’s quantum theory to explain black$-$body radiation.
$ii.$ According to this theory, the energy of electromagnetic radiation depends upon the frequency and not the amplitude.
$iii.$ The smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation is called as ‘quantum’.
$iv.$ The energy $(E)$ of each quantum of radiation is directly proportional to its frequency $(ν).$
$i.e., E ∝ ν ; E = hν$
where, $h =$ Planck’s constant $= 6.626 \times 10^{-34} J s.$
$ii.$ According to this theory, the energy of electromagnetic radiation depends upon the frequency and not the amplitude.
$iii.$ The smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation is called as ‘quantum’.
$iv.$ The energy $(E)$ of each quantum of radiation is directly proportional to its frequency $(ν).$
$i.e., E ∝ ν ; E = hν$
where, $h =$ Planck’s constant $= 6.626 \times 10^{-34} J s.$
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