Enter the force constant (N/cm) and the reduced mass (kg) into the Absorption Frequency Calculator. The calculator will evaluate the Absorption Frequency.

## Absorption Frequency Formula

The following two example problems outline the steps and information needed to calculate the Absorption Frequency.

AF = 1/2*pi * (k/u)^{(1/2)}

Variables:

- AF is the Absorption Frequency (1/cm)
- k is the force constant (N/cm)
- u is the reduced mass (kg)

To calculate the absorption frequency, multiply pi by the ratio of the force constant divided by the reduced mass raised to the one-half power, then divide the result by 2.

## How to Calculate Absorption Frequency?

The following steps outline how to calculate the Absorption Frequency.

- First, determine the force constant (N/cm).
- Next, determine the reduced mass (kg).
- Next, gather the formula from above = AF = 1/2*pi * (k/u)^(1/2).
- Finally, calculate the Absorption Frequency.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

force constant (N/cm) = 30

reduced mass (kg) = 5

AF = 1/2*pi * (k/u)^(1/2)** **= ?