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न्यूट्रॉन की किस गतिज ऊर्जा के लिये डी-ब्रॉगली तरंगदैर्ध्य `1.40xx10^(-10)m` होगा ?

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न्यूट्रॉन की किस गतिज ऊर्जा के लिये डी-ब्रॉगली तरंगदैर्ध्य `1.40xx10^(-10)m` होगा ?
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दिया है : `k=1.38xx10^(-23)JK^(-1)`
(a) `lambda=(h)/(sqrt(2mk))`
या `" "k=(h^(2))/(2lambda^(2))`
`=((6.63xx10^(34))^(2))/(2xx1.677xx10^(-27)xx(1.4xx10^(-10))^(2))`
`=6.686xx10^(-21)J`
`=(6.686xx10^(-21))/(1.6xx10^(-19))eV`
`=4.179xx10^(-2)eV.`
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