Question

A person sitting in a room can hear the sound produced
by person standing outside the room, but he cannot see
him. Why?​

Answer 1

Answer:

As the wavelength of sound is larger than that of the wavelength of light so sound diffracts through the door space but light can't.

Explanation:

As the condition for diffraction is the slit difference must be equal to or closely equal to that of the wave (either sound or light) so door is comparably open as the wavelength of sound so the sound diffracts around the corner and we hear but we can see.