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(A) Diffraction is the phenomenon of bending of waves around the corners of an obstacle or aperture. The condition for significant diffraction is that

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Diffraction of sound is easier as its wavelength is large

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(A) Diffraction is the phenomenon of bending of waves around the corners of an obstacle or aperture. The condition for significant diffraction is that the wavelength of the wave $(\lambda)$ must be comparable to the size of the obstacle or aperture $(a)$.Sound waves have wavelengths in the range of $0.1 \, m$ to $10 \, m$, which is comparable to the size of a door opening. Therefore, sound waves diffract easily around the edges of the door.Light waves have very small wavelengths (in the range of $400 \, nm$ to $700 \, nm$). Since the door opening is much larger than the wavelength of light, light does not undergo significant diffraction and travels in a straight line, preventing us from seeing around the corner.

If a classroom door is open just a small amount, we can hear sounds coming from the room but we can't see what is going on inside the room because

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