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वायु में 300 k ताप पर एक नाइट्रोजन अनु का डी-ब्रॉक्ली तरंगदैघ्र्य कितना होगा ? यह मानों की अनु इस ताप पर अणुओ की चाल वर्ग मध्य से गतिमान है |( नाइट्रोजन का परमाणु द्रव्यमान =` 14* 0076` )

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दिया है --- नाइट्रोजन अनु का द्रव्यमान
`m = 2 xx 14* 0076 xx 1*67 xx 10^(-27)kg`
परमताप `T = 200 K`
औसत `"K.E. " = 3/2kT`
या `1/2 mc^2 = 3/2kt `
`c = sqrt((3kt)/m)`
`:." "lamda = h/(mc)= sqrt(3m kt)`
`=(6*63 xx 10^(-34))/sqrt(3xx46*7xx10^(-10) xx 1*38 xx 10^(-23)xx 300)`
` = (6*63 xx10^(-10))/(24*08) = 0*0275 xx 10^(-9) m`
` = 0*0275 nm`

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