Class 12th

$t_{99.9}=\frac{2.303}{k}\log ?\frac{100}{100-99.9}=3*\frac{2.303}{k}$

$t_{50}=\frac{0.693}{k}$

$\frac{t_{99.9}}{t_{50}}=\frac{3*2.303*k}{k*0.693}=\frac{9}{96}\approx 10$

Optimum pH range for enzymatic activity is 5 to 7

No, in fact, it is one of the easiest chapter of class 12 Physics. Other chapters which are considered comparatively easy are Ray Optics and Electric Charges and Fields.

These two are varied terms, similar in their functioning but differ in their output. Inductance stores energy in the magnetic field to oppose the flow of electric current. And capacitance stores energy in the electric field in order to oppose the flow of voltage through the device. Capacitance is measured through the SI unit Farad (F).

Flux through a surface $\mathrm{?}=\stackrel{?}{E}.\stackrel{?}{A}$

$\mathrm{?}=\left(6\stackrel{?}{i}-4\stackrel{?}{j}+7\stackrel{?}{k}\right).200\stackrel{?}{i}$

$=1200unit$

Resistance of whole wire is

$R=r^{\text{'}}*l$

$20=1*l$

$l=20m$

Let length of the shorter section = a

$\frac{1}{R}=\frac{1}{a}+\frac{1}{\left(20-a\right)}$

$\frac{1}{1.8}=\frac{20-a+a}{a\left(20-a\right)}?20a-a^2=36$

$a=2and18$

$?a=2m$

Ellingham diagram explains the feasibility of reduction process not the kinetics of process.

While both of them oppose the flow of electric current, the key difference lies in their energy output. In the case of resistance, energy is released in the form of heat. On the other hand, inductance stores energy in its magnetic field and doesn't waste it.

Electricity produced by applying pressure on a crystal is known as piezoelectricity.

(Explanation can be elaborate)

$l=\frac{25}{R_{eq}}$

$R_{eq}=25\mathrm{\Omega }$

$l=\frac{25}{25}1A$