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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...

Davisson Germer's experiment | Quantum mechanics

Davisson Germer's experiment

This experiment provide the experimental confirmation of de Broglie hypothesis

Experimental arrangement of Davisson Germer experiment
  • F = Filament, made of tungsten.
  • The electrons are accelerated from F on heating it by a low tension battery.
  • G = An anode containing a fine hole.
  • C = Nickel crystal, the electrons are strike on this crystal and then scattered in all possible directions.
  • D = Detector, which can be rotated on a circular scale S, and this detector is used to measure the intensity of electrons scattered by C.
  • ф = Angle between the incident electron beam on crystal and the scattered direction of electron.
  • If we plot a graph between ф and I (intensity of scattered electron beam by C) at different V.

Conclusions

  • I depends on ф.
  • There is always a bump or kink occurs in the curve at ф = 50°.
  • As the value of accelerating voltage V increases the size of bump increases.
  • The bump become maximum at V = 54 volt.
  • On further increasing the value of V, bump starts to decrease.
  • According to de Broglie

  • From Bragg’s law
            2d sin θ = nλ
  • Here n = order of diffraction, d = inter-planar distance, and θ = glancing angle of diffraction
  • For X-ray analysis Ni works as plane diffraction grating
  • d111 = 0.91 Å for Ni crystal
  • Since diffraction angle ф = 50°
  • Therefore glancing angle θ = (180 ー50) / 2 = 65°
        ∴    2 ✕ 0.91 sin 65° = 1 ✕ λ
        or    λ = 1.65 Å
  • The excellent agreement between the two results for wavelengths (λ) confirms de-Broglie hypothesis for electrons.
  • It means the electron beam of energy 54eV at 50° angle posses strong diffraction, which shows the wave nature and Ni crystal works as diffraction grating.
To know more about Davisson Germer experiment in English please click on the link https://youtu.be/ID3UPMYAZcs and in bilingual (Hindi/English) click on https://youtu.be/VSZn1_2eldo

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