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Questions on the Photoelectric Effect

Q6.

(a) The photoelectric effect is represented by the equation hf = Φ+ Ek. What does Ek represent?

(2 marks)

(b) A metal plate is illuminated with electromagnetic radiation of wavelength 190 nm. The metal has a work function of 7.9 × 10–19 J.

(i) Calculate the frequency of the incident electromagnetic radiation.

(ii) Show that the metal plate will emit photoelectrons when illuminated with radiation of this wavelength.

(iii) The radiation incident on the metal plate remains at a constant wavelength of 190 nm but its intensity is now doubled. State and explain the effect this has on the emitted photoelectrons.

(8 marks)

(Total 10 marks)