Calculate the strength of $20 \, V \, H_2O_2$ in $g/L$.

If a plant is deficient in the element $Zinc$,which plant hormone's biosynthesis will be affected in that plant?

Suppose a pure $Si$ crystal has $5 \times 10^{28} \text{ atoms } m^{-3}$. It is doped by $1 \text{ ppm}$ concentration of pentavalent $As$. Calculate the number of electrons and holes. Given that $n_{i} = 1.5 \times 10^{16} \text{ m}^{-3}$.

$\sqrt[3]{61 - 46\sqrt{5}} = $

If $A = \begin{bmatrix} 1 & 0 & 1 \\ 0 & 1 & 2 \\ 0 & 0 & 4 \end{bmatrix}$,then show that $|3A| = 27|A|$.