Question

a _____ neither allow inner sound to go out nor allows outer sound to come in. ​​

Answer 1

Hearing allows one to identify and recognize objects in the world based on the sound they produce, and hearing

makes communication using sound possible. Sound is derived from objects that vibrate producing pressure variations in a sound-transmitting medium, such as air. A

pressure wave is propagated outward from the vibrating source. When the pressure wave encounters another

object, the vibration can be imparted to that object and the pressure wave will propagate in the medium of the object. The sound wave may also be reflected from the object or it may diffract around the object. Thus, a sound wave propagating outward from a vibrating object can reach the eardrum of a listener causing the eardrum to vibrate and initiate the process of

hearing.