Question

the softest sound a human can hear is​

Answer 1

Answer:

So then, we must know what R is. But, in this case, it's the smallest sound the average adult can detect at 1 kilohertz, which can change from person to person. Typically, zero decibels sound pressure level (SPL) corresponds to 0.000002 Pascals — a measure of vibration or pressure waves that we really hear.

Answer 2

Explanation:

Loudness describes how people perceive sound (see loudness). The softest sounds that young adults can hear in a frequency range of 1000 Hz to 3000 Hz have a measured sound intensity of 0 decibels relative to the intensity of a sound wave with a pressure of 20 microPascals (dB re 20 µPa).