Enter the Planck’s constant (6.262E-34) and the threshold frequency (hz) into the Calculator. The calculator will evaluate the Energy Threshold.

## Energy Threshold Formula

ET = h * TR

Variables:

- ET is the Energy Threshold (Joules)
- h is the Planck’s constant (6.262E-34)
- TR is the threshold frequency (hz)

To calculate Energy Threshold, multiply Planck’s constant by the threshold frequency.

## How to Calculate Energy Threshold?

The following steps outline how to calculate the Energy Threshold.

- First, determine the Planck’s constant (6.262E-34).
- Next, determine the threshold frequency (hz).
- Next, gather the formula from above = ET = h * TR.
- Finally, calculate the Energy Threshold.
- 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.

Planck’s constant (6.262E-34) = 6.26E-34

threshold frequency (hz) = 600