COMPUTER NETWORKS AND COMMUNICATIONS
WIRELESS COMMUNICATION TECHNOLOGIES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Large buildings, earth surface and objects with large surface area
|
|
|
Obstacles with dimensions in order of wavelength
|
|
|
Surfaces with rough textures such as Foliage, lamp posts, street signs, walking pedestrian, etc.
|
|
|
None of the above
|
Detailed explanation-1: -The size of obstacle or aperture required for diffraction of light must be of the order of Angstrom.
Detailed explanation-2: -Diffraction is defined as the interference or bending of waves around the corners of an obstacle or through an aperture into the region of geometrical shadow of the obstacle/aperture. The diffracting object or aperture effectively becomes a secondary source of the propagating wave.
Detailed explanation-3: -Interference is a property originated by waves from two different coherent sources, whereas secondary wavelets that originate from the same wave but occur from different parts of it, produce the phenomenon termed diffraction.
Detailed explanation-4: -The effects of diffraction are much more noticeable if the size of the obstacle is small (a few wavelengths across), while a given size of obstacle will diffract a wave of long wavelength more than a shorter one. Diffraction can be easily demonstrated with sound waves or microwaves.