1. Ernerst Rutherford =====> Discovery of Atomic Nucleus
2. James Chadwick =====> Discovery of Neutron
3. Henri Becquerel =====> Discovery of Radioactivity
4. J.J. Thomson =====> Discovery of Electron
Answer:

Explanation:
Since there's no external force beside gravity acting on the rod, we can use the law of energy conservation to calculate for the speed of rod center of gravity before hitting the surface.
Also as the rod is uniform and this, its center of gravity is at distance h/2 from the surface.




The moon does not have an atmosphere because it is not a planet. It is just a big lump of rock that has a core. It was created from the Earth.