Can we generate electrognetic waves of frequency `6.2 xx 10 ^(14) Hz ` in the visable region of light by oscillating charges ?

Explanation

No. We cannot generate electromagnetic waves in the visible region by this method. To generate electromagnetic waves, charge is oscillated at some frequency which generates an Oscillating electric field which in turns produces oscillating magnetic field. This further produces oscillating electric field and so on. These simultaneous procedures generate electromagnetic wave of the same frequency. Thus to generate electromagnetic waves in visible region, charge will have to be oscillated with the same frequency which is practically not possible.