Final answer:
A spectrophotometer is the instrument used in this experiment to measure how much light energy is absorbed by a sample at a particular wavelength.
Step-by-step explanation:
The instrument used in this experiment is called a spectrophotometer. A spectrophotometer is the instrument used in this experiment to measure how much light energy is absorbed by a sample at a particular wavelength.
A spectrophotometer measures how much light energy is absorbed by a sample placed in the light beam of the instrument.
It does this by transmitting light of a particular wavelength through the sample and analyzing the intensity of the transmitted light.
By measuring the amount of light absorbed by the sample at different wavelengths, scientists can gather information about the composition and properties of the sample.