Test Your Knowledge of Photometry
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Questions and Answers

Which of the following describes the process of measuring the absorbance or optical density of a solution using a photodetector system and a galvanometer?

  • The photodetector system measures the transmitted light, while the galvanometer measures the electrical signals
  • The photodetector system measures the absorbed light, while the galvanometer measures the reflected light
  • The photodetector system measures the reflected light, while the galvanometer measures the transmitted light
  • The photodetector system measures the transmitted light, while the galvanometer measures the absorbed light (correct)

    • What happens to the light when it reaches the Cuvette during the process of measuring the absorbance or optical density of a solution?

  • All of the light is absorbed by the solution
  • Some of the light is reflected, some part of the light is absorbed by the solution and the remaining part is transmitted through the solution (correct)
  • All of the light is reflected
  • All of the light is transmitted through the solution

    • What is the role of the galvanometer in the process of measuring the absorbance or optical density of a solution?

  • To measure the intensity of absorbed light
  • To measure the intensity of transmitted light
  • To measure the intensity of reflected light
  • To measure the electrical signals sent by the photodetector system (correct)

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