Why do all electrons emitted during beta decay not have the same energy? give reasons.

Do all photoelectrons emitted from a metal surface possess th esame energy?

Every mrtal has a definite work function. Why do all photoelectrons not come out with same energy, if incident radiation is monochromatic? Why is there an energy distribution of photoelectrons?

Why are diamonds used in jewellery? give reasons

Two parallel wires carryiing current in the same direction attract each other, while two beams of electrons travelling in the same diection repel each other. WHy? Give reasons.

Why mosses/ferns are so few? Give reason.

Why do all helicopters have two properllers?

A proton, a neutron, an electron and alpha -particle have the same energy. Then their de-Broglie wavelengths compare is

Why do neurons not have division power?