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


  • 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.

  1. First, determine the Planck’s constant (6.262E-34). 
  2. Next, determine the threshold frequency (hz). 
  3. Next, gather the formula from above = ET = h * TR.
  4. Finally, calculate the Energy Threshold.
  5. 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