A lamp radiates power `P_(0)` uniformly in all directions, the amplitude of elctric field strength `E_(0)` at a distance `r` from it is

A point source of 2 watt is radiating uniformly in all direction in vacuum. Find the amplitude of electric field at a distance 2m from it-

A red LED emits light a 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is

A Red LED emits light 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is :

Electric field strength E due to a short dipole at a distance r from it are related as: