Enter the initial and transmitted light intensities into the calculator to determine the percent transmittance. This calculator helps in understanding how much light passes through a substance.
Percent Transmittance Formula
The following formula is used to calculate the percent transmittance:
T = (I / I₀) * 100
Variables:
- %T is the percent transmittance
- I is the transmitted light intensity
- I₀ is the initial light intensity
To calculate the percent transmittance, divide the transmitted light intensity by the initial light intensity and then multiply by 100 to convert it to a percentage.
What is Percent Transmittance?
Percent transmittance is a measure of how much light is transmitted through a substance relative to the light that initially strikes it. It is a key parameter in spectrophotometry, which is used to measure the intensity of light absorbed by a sample. A higher percent transmittance indicates that more light has passed through the substance, while a lower percent transmittance indicates more light has been absorbed or reflected.
How to Calculate Percent Transmittance?
The following steps outline how to calculate the percent transmittance:
- First, measure the initial light intensity (I₀) that strikes the substance.
- Next, measure the transmitted light intensity (I) that passes through the substance.
- Use the formula %T = (I / I₀) * 100 to calculate the percent transmittance.
- Finally, enter the measured values into the calculator to verify the percent transmittance.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Initial light intensity (I₀) = 150 units
Transmitted light intensity (I) = 75 units
