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भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती पर व्याख्यान का आयोजन

भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती पर व्याख्यान का आयोजन विज्ञान भारती उदयपुर इकाई एवं बीएन कॉलेज ऑफ फार्मेसी, बीएन विश्वविद्यालय के संयुक्त तत्वावधान में कार्यक्रम सम्पन्न उदयपुर, 2 अगस्त। भारतीय रसायन के पिता आचार्य प्रफुल्ल चंद्र रे की जयंती के अवसर पर विज्ञान भारती उदयपुर इकाई (चित्तौड़ प्रांत) एवं बीएन कॉलेज ऑफ फार्मेसी, बीएन विश्वविद्यालय के संयुक्त तत्वावधान में एक विशेष व्याख्यान का आयोजन किया गया। कार्यक्रम का उद्देश्य आचार्य पी.सी. रे के वैज्ञानिक योगदान एवं उनके देशभक्ति से ओतप्रोत जीवन पर प्रकाश डालना था। ज्ञातव्य है कि भारत की पहली फार्मा कंपनी आचार्य रे ने ही बंगाल केमिकल एंड फार्मास्यूटिकल्स लिमिटेड, कोलकाता में 1901 में प्रारंभ की थी। कार्यक्रम में विज्ञान भारती के उद्देश्य एवं गतिविधियों की जानकारी डॉ. अमित गुप्ता द्वारा दी गई। आचार्य पी.सी. रे के जीवन और कार्यों पर मुख्य व्याख्यान डॉ. लोकेश अग्रवाल द्वारा प्रस्तुत किया गया। उन्होंने बताया कि कैसे आचार्य रे ने विज्ञान को समाज की सेवा का माध्यम बनाया और रसायन विज्ञान में भारत को आत्मनिर्भर बनान...
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Planck's Radiation Law | Planck's radiation formula

Planck's Radiation Law

  • This is application of Bose-Einstein statistics.
  • According to quantum theory, the radiant energy occurs in energy packets.
  • These packets are known as quanta or photon.
  • The energy of packet should be h times the frequency of photon.
  • The momentum of each packet should be h/c times the frequency of photon.
  • The photons are indistinguishable particles having zero rest mass and having spin quantum number 1.
  • Thus photons are Bose particle and hence Bose Einstein statistics can be applied on it.
  • By using Planck's radiation law, we can also establish the Rayleigh Jean’s law, Wein’s law and Stefan-Boltzmann’s law.

Planck's radiation law

  • According to Planck, the energy density of radiations emitted from a black body in the wavelength range λ and λ + dλ is, uλ dλ = (Nλ dλ) E 
  • Here Nλ dλ = Number of oscillators (number of modes of vibration) in the wavelength range λ and λ + dλ
  • E is average energy of Planck's oscillator.
Since
Therefore
This is Planck’s radiation formula in terms of wavelength 

Since
Therefore
This is Planck’s radiation formula in terms of frequency

To know more about this lecture you can visit https://youtu.be/UHW5KkQMUpE
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