$\begin{array}{1 1}(a)\;32& (b)\;16 \\(c)\;64&(d)\;40\end{array} $

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- The modern form the Dulongâ€“Petit law is : $\large cM = 3R$
- Dulong and Petit from their researches upon the elements concluded that the ultimate atoms of all elements possessed the same capacity for heat and they accordingly announced the law that :

" The specific heat of elementary substances is in their inverse ratio to their atomic weights."

$\large\frac{6.4}{\text{specific heat}}$=Approx.At.wt=$\large\frac{6.4}{0.16}$

$\Rightarrow 40$

Henc (d) 40 is the correct answer.

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