In the following common emitter circuit,if $\beta = 100$,$V_{CE} = 7 \text{ V}$,$V_{BE} = 0 \text{ V}$ (negligible),and $R_C = 2 \text{ k}\Omega$,then find $I_B$ in $\text{mA}$.

In which of the following ionization processes does the bond energy increase and the magnetic behaviour change from paramagnetic to diamagnetic?

$A$ particle of mass $4 m$ explodes into three pieces of masses $m, m$ and $2 m$. The equal masses move along $X$-axis and $Y$-axis with velocities $4 ms^{-1}$ and $6 ms^{-1}$ respectively. The magnitude of the velocity of the heavier mass is

$\int \frac{dx}{\sqrt{x}(x+9)}$ is equal to

One of the major components of the cell wall of most fungi is

Ferrous ion changes to $X$ ion upon reacting with acidified hydrogen peroxide. The number of $d$-electrons present in $X$ and its magnetic moment (in $BM$) are,respectively: