Question

What happens when
1) Phosphorous is added to pure silicon
2) Aluminium is added to pure silicon
3) A.C is passed into Dipole Antenna
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Answer 1

1)When Phosphorous is added to pure silicon it becomes a N- type semiconductor
2)When aluminium is added to pure silicon  it becomes a P- type semiconductor
3)When A.C is passed into dipole antenna it emits electromagnetic radiations.