who we hear a loud sound form a distance and why we cannot hear soft sound from distance.why

The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear. These bones amplify, or increase, the sound vibrations and send them to the inner ear. The inner ear contains a snail-shaped structure filled with fluid called the cochlea.

Dear student 

As distance from the sound source increases, the area covered by the sound waves increases. The same amount of energy is spread over a greater area, so the intensity and loudness of the sound is less. This explains why even loud sounds fade away as you move farther from the source

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the intensity unables to moves our eardrum because it loses most of energy due to disturbances in the nature