Diffraction effects are more noticeable when the obstacle/aperture size is:
AMuch larger than wavelength
BComparable to or smaller than the wavelength
CMuch smaller than nm
DIndependent of size
Answer & Solution
Correct answer: B. Comparable to or smaller than the wavelength
Diffraction: bending of waves around edges/apertures. Noticeable when slit width ~ λ. For visible light (~500 nm), diffraction effects visible only with very narrow slits. Sound waves (λ ~ m) easily diffract around ordinary obstacles.
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