question_answer

Radio waves diffract pronouncedly around the buildings, while light waves, which are e. m. waves, do not. Why?

Answer:

                For diffraction to take place, the wavelength should be of the order of the size of the obstacle. The radio waves (particularly short radio waves) have wavelengths of the order of the size of the building and other obstacles coming in their way and hence they easily get diffracted. Since wavelength of the light waves is very small, they are not diffracted by buildings.