Calculates the natural frequency given the inductance, capacitance and resistance. In the acoustic case
the inductance is inertia or mass, the capacitance is elasticity (bulk modulus) and resistance is composed of air
resistance and related quantities. All units are SI.

## Usage

`naturalFrequency(L, C = "default", R)`

## Arguments

- L
Inductance

- C
Capacitance, by default IUPAC standard pressure.

- R
Resistance

## Details

For isothermal compression, the bulk modulus is equal to the pressure. The default value of C therefore is the IUPAC
standard pressure.

## Examples

```
naturalFrequency(L=20,R=0.5)
#> [1] 0.002950812
naturalFrequency(L=20,C=1/4,R=0.5)
#> [1] 0.07114845
```