Mini-Quiz: Photodetectors

1. Heinrich Hertz discovered the photoelectric effect, but who first explained why it worked?

   His brother Rudolf Hertz, who was a biology professorSorry, not correct. Try another button. Albert Einstein in his first published paperThat is correct. You know your electro-optics. No one has yet be able to explain the effectGood try, but not right. Select another answer.

2. What is an advantage of phototransistors over photodiodes?

   They are more sensitive to lightCorrect. You are doing a great job. They are much smallerOops! Wrong answer. Re-read the question and try again. They can be purchased in most storesSorry, not correct. Try another button.

3. How is the change in conductivity of a material measured?

   By measuring its expansion with the increase in temperatureOops! Wrong answer. Re-read the question and try again. By adding a conductivity-o-gram in the circuitGood try, but not right. Select another answer. By running a small current through it and measuring the electrical resistanceThat is correct. You know your electro-optics.

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