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यंग के द्विक रेखा – छिद्र प्रयोग में इलेक्ट्रॉनो का पुँज प्रयुक्त किया गया है। यदि इलेक्ट्रॉनो की चाल बढ़ा दी जाती है। तब फ्रिन्ज- चौडाई :
A. बढ़ जायेगी
B. घट जायेगी
C. वही रहेगी
D. ‌फ्रिन्जे दिखाई नहीं देगी।

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Correct Answer - B
इलेक्ट्रॉनों की चाल बढ़ाने पर ,उनकी (दी - ब्रोगली) तरंगदैर्ध्य घटेगी `(lambda = h // m u)` अतः फ्रिन्ज - चौडाई `W( = D lambda //d)` घटेगी।

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