GaAsP का उपयोग करके किसी p-n संधि डायोड से किसी LED की रचना की गयी है। ऊर्जा अन्तराल 1.9 eV है। उत्सर्जित प्रकाश की तरंगदैर्घ्य होगी -

  1. 654 Å
  2. 654 × 10−11 m
  3. 10.4 × 10−26 m
  4. 654 nm

Answer (Detailed Solution Below)

Option 4 : 654 nm
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संकल्पना:

तरंग दैर्ध्य निम्न रूप में लिखा गया है;

\(λ = \frac{hc}{E_g}\)

यहाँ हमारे पास \(λ\) तरंगदैर्घ्य है, h प्लैंक नियतांक है, c प्रकाश की चाल है और E g ऊर्जा बैंड अन्तराल है।

गणना:

दिया गया है: ऊर्जा बैंड अन्तराल , Eg = 1.9 eV

The photon energy in eV using the wavelength in μm, the equation is approximately

\(E (eV) = \frac{1.240}{\lambda (μ m)}\ \)

Now, on putting the given values we have;

\(λ = \frac{1.24}{1.9} \ μ m\)

⇒λ = 0.6526 μm 

⇒λ ≈ 652.6 nm

अत: विकल्प 4) सही उत्तर है।

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