$A$ big liquid drop splits into $n$ similar small drops under isothermal conditions. Then, in this process:

Which one of the following aqueous solutions will exhibit the highest boiling point?

If $y=A \cos n x+B \sin n x$, then $y_2+n^2 y$ is equal to

$A:$ Hormones are non-nutrient chemicals.
$B:$ They act as intercellular messengers and are produced in large amounts.

$A$ radioactive material decays by simultaneous emission of two particles with respective half-lives $1620 \, years$ and $810 \, years$. The time, in years, after which one-fourth of the material remains is

$A$ proton, a deuteron, and an $\alpha$-particle having the same momentum enter a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is