Question

Why is the diffraction of sound waves more evident in daily experience than that of light wave?

Solution

We know that frequencies of sound waves varies from $$20 Hz$$ to $$20,000 Hz$$, so its corresponding wavelength varies from $$15m$$ to $$15mm$$ respectively. The size of slit (almost) becomes comparable to wavelength of sound so diffraction of sound wave takes place easily. But the wavelength of visible light varies from $$0.4$$ to $$0.7 micron$$ which is very small. So the size of most of the slits is not comparable with wavelength of visible light, due to this diffraction of light cannot take place. PhysicsNCERTStandard XII

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