engineering recuitment NIELIT Scientific Assistant Mock Test 2025 Electronic Devices Carriers in Semiconductors Extrinsic Fermi Level

लेज़र का सिद्धांत है 

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स्वतः अवशोषण
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अनुकारित उत्त्सर्जन
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प्रेरण उत्त्सर्जन
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दोनों (b) एवं (c)
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