Enter the work function of the metal body (J) into the calculator to determine the Threshold Frequency.

Threshold Frequency Formula

The following formula is used to calculate a threshold frequency.

f0 = E / h 
  • Where fo is the threshold frequency
  • E is the work function
  • h is planck’s constant (6.62607004 × 10-34 m2 kg / s)

To calculate the threshold frequency, divide the work function by Planck’s constant.

What is a threshold frequency?


A threshold frequency is defined as the minimum frequency of radiation towards a piece of metal that will create a photoelectric effect.

How to calculate threshold frequency?

Example Problem:

The following example outlines how to calculate the threshold frequency of a piece of metal.

First, determine the work function of the metal. In this example, the work function is found to be 1.25 * 10 ^- 31

Next, the final and last step is to use the formula above to calculate the threshold frequency.

f0 = E / h

f0 = 1.25 * 10 ^- 31 / 6.62607004 × 10^-34

f0 = 188.684 hz