What is diffraction?

What is diffraction?

• A. Radio waves bouncing off a surface
• B. Scattering
• C. Refraction
• D. Radio waves bending and moving around an object

Answer: (D)

Diffraction is the bending and spreading of waves as they pass around obstacles or through openings. When radio waves meet an object, part of the wavefront wraps around the edge and propagates into the region behind the object, so energy can appear where there isn’t a direct line of sight. This effect is more noticeable when the obstacle or opening is about the same size as the wavelength. That’s why signals can seem to reach receivers around corners or behind small structures, though the strength may drop. The other options describe different wave behaviors: reflection is waves bouncing off a surface, refraction is bending when waves move into a different medium with a different speed, and scattering is waves being redirected in many directions due to irregularities. So the idea of radio waves bending and moving around an object is exactly what diffraction describes.

Diffraction is the bending and spreading of waves as they pass around obstacles or through openings. When radio waves meet an object, part of the wavefront wraps around the edge and propagates into the region behind the object, so energy can appear where there isn’t a direct line of sight. This effect is more noticeable when the obstacle or opening is about the same size as the wavelength. That’s why signals can seem to reach receivers around corners or behind small structures, though the strength may drop. The other options describe different wave behaviors: reflection is waves bouncing off a surface, refraction is bending when waves move into a different medium with a different speed, and scattering is waves being redirected in many directions due to irregularities. So the idea of radio waves bending and moving around an object is exactly what diffraction describes.