To determine the acoustic amplitude of a sound wave based on its dBA value, you need to understand that dBA is a unit used to measure sound pressure levels on a logarithmic scale, specifically adjusted to approximate the human perception of sound. It takes into account the frequency response of the human ear and is weighted to reflect the ear's sensitivity to different frequencies.
However, the dBA value alone does not provide sufficient information to calculate the exact acoustic amplitude of a sound wave. The dBA scale represents a relative measure of sound intensity rather than an absolute measure. It compares the sound pressure level to a reference value, which is typically the threshold of human hearing.
If you have access to additional information, such as the reference sound pressure level or the sound pressure level in a specific unit (e.g., pascals or decibels), you can make calculations to determine the acoustic amplitude. Otherwise, without more data, it's not possible to convert a dBA value directly into an acoustic amplitude measurement.