Chapter 3, Problem 25PP

Sound level L in units of decibel (dB) is determined by

$L=20{\log }_{10}\left(p/p_0\right)$

where p is the sound pressure of the sound (in Pascals, abbreviated Pa), and p₀ is a reference sound pressure equal to $20\times {10}^{-6}$ Pa (where L is 0 dB). The following table gives descriptions for certain sound levels.

Write a program that reads a value and a unit, either dB or Pa, and then prints the closest description from the list above.