Question

How is the loudness of sound related to : 

1. amplitude of the vibrating body, 

2. distance of the observer from the vibrating body, 

3. density of the medium producing sound, 

4. frequency of sound.

Answer 1

1. More the amplitude, louder it is. 

2. Loudness or intensity of sound I ∝ 1/(Distance) Loudness decreases with increase in distance. 

3. Loudness is directly proportional to density of medium. 

4. Sound waves of the same Intensity but of different frequencies usually have different loudness.