Rutherford’s scattering experiment is related to the size of the

$A$ line is at a constant distance $c$ from the origin and meets the coordinate axes in $A$ and $B$. The locus of the centre of the circle passing through $O, A, B$ is

Which of the following have sunken stomata?

Two point charges $-q$ and $+q$ are located at points $(0, 0, -a)$ and $(0, 0, a)$ respectively. The potential at a point $(0, 0, z)$ where $z > a$ is

The lanthanide contraction is responsible for the fact that

The correct order of reactivity of hydrogen halides with ethyl alcohol is