Here's a breakdown of what happens:
* Wave nature of sound: Sound travels as waves, meaning it has crests and troughs. These waves can interact with objects in their path.
* Obstacle encounter: When a sound wave encounters an obstacle, it doesn't simply stop. Instead, the wavefronts spread out and bend around the edges of the obstacle.
* Wavelength and obstacle size: The amount of diffraction depends on the wavelength of the sound wave and the size of the obstacle.
* Larger wavelength: Sound waves with longer wavelengths (lower frequency) diffract more easily around obstacles. This is why you can hear someone talking around a corner even if you can't see them.
* Smaller obstacle: If the obstacle is much smaller than the wavelength of the sound, the wave will diffract significantly. This is why you can hear sounds coming from behind a thin wall, even if you're standing directly in front of it.
In summary: Diffraction is the bending of waves around obstacles, which allows us to hear sounds even when they are not directly in front of us. The extent of diffraction depends on the relationship between the wavelength of the sound and the size of the obstacle.
