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# Density and youngs modulus of a certain hypothetical material are $\;5 \;gm/cm^{3}\;$ and $\;2\times10^{10} pa\;$ velocity of sound in this material is

$(a)\;4 \times10^{3}\;m/s\qquad(b)\;10^{3}\;m/s\qquad(c)\;8 \times10^{3}\;m/s\qquad(d)\;None\;of\;these$

Answer : (d) None of these
Velocity of sound = $\;\sqrt{\large\frac{y}{d}}$
$y=2 \times 10^{10} pa$
$d=5 gm/cm^{3}=5\times10^{3}\;kg/m^{3}$
velocity (v) = $\;\sqrt{\large\frac{2\times10^{10}}{5\times10^{3}}}=2\times10^{3}\;m/s$