The theory of electronic conduction in solids, which satisfactorily explains the properties of conductors, insulators and semi-conductor,is?

I. The number of neutrons released exceeds the number that caused the fission.
II. There is loss of mass.
III. Energy is produced.
IV. Smaller nuclei merge to form larger nuclei
which of the statement above are correct about nuclear fission?

A certain manufacturer wishes to make an n-type semiconductor. Which materials would he select for doping?

A p-n junction diode is used as?

An object placed 10cm from a concave mirror of focal length 5cm would have its image