Find the ratio of de Broglie wavelength of molecules of hydrogen and helium which are at temperatures `27^circ` and `127^circC`,

De-Broglie wavelength
`lambda=h/p=h/(sqrt(2mK))=h/(sqrt(2m(3/2kT)))=h/(sqrt(2mkT))`
of `lambdaprop1/T`
`:. (lambda_(27))/(lambda_(127))=sqrt((127+273)/(27+273))=sqrt(4/3)=(2sqrt2)/3=1.155`

Find the ratio of de Broglie wavelength of molecules of hydrogen and helium which are at temperatures `27^circ` and `127^circC`, respectively.

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