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Find the ratio of de Broglie wavelength ...

Find the ratio of de Broglie wavelength of molecules of hydrogen and helium which are at temperatures ` 27^(@) " and " 127^(@) C ` respectively

Text Solution

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The translational kinetic energy of a molecule at a temperature T is `E=3/2kT`.
So, `lambda=h/sqrt(3mkT)` as `lambda=h/sqrt(2mE)`
`lambda_(H_2)/lambda_(He)=sqrt((m_"He"T_"He")/(m_(H_2)T_(H_2)))`
`lambda_(H_2)/lambda_"He"=sqrt(8/3)`
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