A student performs experiment with simple pendulum and measures time for $10$ vibrations. If he measures a time for $100$ vibrations, the relative error in measurements of time period will be reduced by $n\%$. The value of $n$ is

van der Waal's gas equation for $n$ number of moles is given by the formula $\left(P+\frac{n^{2}a}{V^2}\right)\left(V-nb\right)=nRT$, where $P$ is pressure, $V$ is volume, $R$ is gas constant and $T$ is temperature.

Dimensions of $a$ is

van der Waal's gas equation for $n$ number of moles is given by the formula $\left(P+\frac{n^{2}a}{V^2}\right)\left(V-nb\right)=nRT$, where $P$ is pressure, $V$ is volume, $R$ is gas constant and $T$ is temperature.

van der Waal's gas equation for $n$ number of moles is given by the formula $\left(P+\frac{n^{2}a}{V^2}\right)(V-nb)=nRT$, where $P$ is pressure, $V$ is volume, $R$ is gas constant and $T$ is temperature.