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During an experiment, light of different frequencies is radiated onto a silver cathode of a photocell and the corresponding maximum speed of the ejected photoelectrons are measured.
A graph of the energy of the incident photons versus the square of the maximum speed of the ejected photoelectrons is shown below.
10.1 Define the term photoelectric effect. (2)
Use the graph to answer the following questions.
10.2 Write down the value of the work function of silver.
Use a relevant equation to justify the answer. (3)
10.3 Which physical quantity can be determined from the gradient of the graph? (1)
10.4 Calculate the value of X as shown on the graph. (5)
The experiment above is now repeated using light of higher intensity.
10.5 How will EACH of the following be affected? Choose from INCREASES, DECREASES or REMAINS THE
SAME.
10.5.1 The gradient of the graph (1)
10.5.2 The number of photoelectrons emitted per unit time (1)
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TOTAL: 150