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Question 11

In an experiment to demonstrate the photoelectric effect, light of different wavelengths was shone onto a metal surface of a photoelectric cell. The maximum kinetic energy of the emitted electrons was determined for the various wavelengths and recorded in the table below.

11.1 What is meant by the term photoelectric effect? (2)

11.2 Draw a graph of Ek(max) (y-axis) versus 1⁄λ (x-axis) ON THE ATTACHED ANSWER SHEET. (3)

11.3 USE THE GRAPH to determine:

11.3.1 The threshold frequency of the metal in the photoelectric cell (4)

11.3.2 Planck’s constant (4)

[13]

TOTAL: 150

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