The human hindbrain comprises three parts,one of which is:

Extraction of zinc from zinc blende is achieved by:

The part of the fallopian tube closest to the ovary is -

With an increase in atomic number,the melting point of alkali metals .......

The $r.m.s.$ value of an $AC$ of $50\,Hz$ is $10\,A$. The time taken by the alternating current to reach from zero to maximum value and the peak value of current will be:

An organ pipe $P_1$ closed at one end is vibrating in its first overtone. Another pipe $P_2$ open at both ends is vibrating in its third overtone. They are in resonance with a given tuning fork. The ratio of the length of $P_1$ to that of $P_2$ is