Question

Diffraction is:A.the difference in density of the compression and rarefaction parts of a sound wave.B.the change of frequency heard by an observer when sound waves come from a moving source.C.when waves suddenly appear in a medium without a source.D.the apparent bending of sound waves around obstacles.

Answer 1

Diffraction is a phenomenon that occurs when a wave hits an object or it passes through a small gap.

The propagation of the wave will have a circular pattern after the diffraction effect:

Therefore the correct option is D.