The conjugate acid of $NH_2^-$ is ...... .

The dominant mechanism for the motion of charge carriers in forward and reverse biased silicon $P-N$ junction are:

If $0 < y < 2^{1/3}$ and $x(y^3 - 1) = 1$,then $\frac{2}{x} + \frac{2}{3x^3} + \frac{2}{5x^5} + \dots$ is equal to:

The equation of the parabola with focus $(0, 0)$ and directrix $x + y = 4$ is

For a gas,$\frac{R}{C_{V}}=0.4$,where $R$ is the universal gas constant and $C_{V}$ is the molar specific heat at constant volume. The gas is made up of molecules which are

When a capacitor is connected in series to an $LR$ circuit,the alternating current flowing in the circuit