In the equation $\log\, S = \log\, C + Z\, \log\, A$,what does $S$ represent?

When acetamide reacts with $Br_2$ and caustic soda,then we get:

In the circuit shown,the energy stored in the $1\,\mu F$ capacitor is ..... $\mu J$.

The whorl of bracts present below the inflorescence of $Helianthus$ $(sunflower)$ is

Which of the following secretes interferons?

The radius of the first orbit of hydrogen is $r_{H}$,and the energy in the ground state is $-13.6 \text{ eV}$. Considering a $\mu^{-}$-particle with a mass $207 m_e$ revolving around a proton as in a hydrogen atom,the energy and radius of the proton and $\mu^{-}$-combination respectively in the first orbit are (assume the nucleus to be stationary):