Question

Explain how electromagnetic radiation carries information and why different kinds of radiation can resolve different kinds of objects.

Answer 1

Electromagnetic waves carry information in the form of its different parameters - frequency (no. Of waves per sec) , period (distance between 2 crests or troughs), wavelength (distance between one crest and trough, amplitude (height of a crest). Values for these in different combination defines a wave, it's source, it's particle, and further such information.

Different kinds of EM can resolve different types of object because only those EMs can be absorbed by an object whose wavelength matches it's (object's) size.