Question

You can hear sound from another room through a door that is slightly open because...the sound refracts as it goes from one room to another.the sound wave reflects off the air in the doorway.the sound diffracts as it goes through the opening.the sound is polarized as it goes through the narrow opening.

Answer 1

when sound wave go from small passages like the edge of a wall or from the slit of open door the sound wave diffracts.

So the 3rd option is correct option.