Spectrophotometer Quiz

What is Beer’s Law primarily used for?

• Measuring light intensity

• Determining the concentration of a substance

• Identifying parts of a spectrophotometer

• Calculating the wavelength of light

Answer explanation

Beer’s Law relates the absorbance of light to the concentration of a substance in a solution. Therefore, it is primarily used for determining the concentration of a substance.

Which type of light does a UV spectrophotometer use?

• Infrared light

• Visible light

• Ultraviolet light

• X-ray light

Answer explanation

A UV spectrophotometer specifically uses ultraviolet light to measure the absorbance of samples. This distinguishes it from instruments that use infrared, visible, or X-ray light.

What does a spectrophotometer measure?

• The color of a sample

• The volume of a sample

• The temperature of a sample

• The amount of light transmitted through a sample

Answer explanation

A spectrophotometer measures the amount of light transmitted through a sample, allowing for the analysis of its concentration and properties. The other options do not accurately describe its function.

What is the purpose of a standard curve in spectrophotometry?

• To measure the temperature of a solution

• To determine the concentration of an unknown sample

• To calculate the absorbance of light

• To identify the color of a sample

Answer explanation

A standard curve in spectrophotometry is used to determine the concentration of an unknown sample by comparing its absorbance to that of known standards, allowing for accurate quantification.

Which part of a spectrophotometer is responsible for directing light?

• Detector

• Sample holder

• Lamp

• Prism or grating

Answer explanation

The prism or grating in a spectrophotometer is responsible for directing light by dispersing it into its component wavelengths, allowing for analysis of the sample's absorbance at specific wavelengths.