Enter the frequency of the red light (hz) and the ${V2} into the calculator to determine the Red Light Energy.

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## Red Light Energy Formula

The following equation is used to calculate the Red Light Energy.

**E = h*fr**

Variables:

- Where E is the Red Light Energy (Joules)
- fr is the frequency of the red light (hz)
- h is the Planck’s Constant (6.626 * 10 ^-34 J-s)

## How to Calculate Red Light Energy?

The following two example problems outline the steps and information needed in order to calculate the Red Light Energy.

**Example Problem #1:**

- First, determine the frequency of the red light (hz). In this example, the frequency of the red light (hz) is measured to be 40000.
- Finally, calculate the Red Light Energy using the formula above:

E = h*fr

Inserting the values from above and solving the equation with the imputed values gives:

E = 6.626 * 10 ^-34*40000 = 2.65e-29 (Joules)

**Example Problem #2: **

Using the same process as example problem 1, we first define the needed variables outlined by the formula. In this case, the values are provide as:

frequency of the red light (hz) = 2000

Entering these values into the formula or calculator above gives us:

E = 6.626 * 10 ^-34*2000 = 1.3252e-30** **(Joules)