Question

Radio waves diffract around the buildings, although light waves do not. The reason is that radio waves

• A. Travels with speed larger than c
• B. Have much larger wavelength than light
• C. Are non electromagnetic waves
• D. None of these

Answer 1

The correct option is B Have much larger wavelength than light

Both radio and light waves are EM waves, just in different frequency ranges. The wavelength of visible light is typically around the $600nm$ range, which is 6/1000 of a millimeter (very small!). Radio waves on the other hand, often wave wavelengths of a few yards long. For a wave to diffract around an object, the size of the object must be on the same order of the wavelength of the wave.

So, option $B$ is correct.