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किस तप पर ध्वनि की हाइड्रोजन में वही चाल होगी जोकि `100^(@)C` पर ऑक्सीजन में है? ऑक्सीजन व हाइड्रोजन के घनत्व `16:1` के अनुपतात में होते है।

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`v=sqrt((gammaRT)/(M))`
`:. sqrt((T)/(M_(H)))=sqrt((T_(100))/(M_(0)))`
अथवा `(T)/(T_(100))=(M_(H))/(M_(O))`
अथवा `(T)/(373K)=(M_(H))/(M_(O))=(1)/(16)`
`:.T=(373K)/(16)=23.3K=23.3-273=249.7^(@)C`

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