Reply To: Hi! I read that human ear can hear sounds in the range of 20 to 20000 Hz. What does that mean? What

[prajput]

No, the loudness of a sound is determined by its amplitude. Amplitude is the maximum displacement of a vibrating body (air particles through which sound waves are propagating in this case) from its equilibrium position. For a human ear to perceive a sound, the frequency of the sound wave has to be between 20 to 20000 Hz, AND its amplitude should be large enough. In this case, reducing the distance between you and the person increases the amplitude of the sound and hence it becomes louder due to which you can hear it. The frequency of the sound remains unchanged by the distance.