A-level Physics · Photoelectric effect

Threshold frequency

Link the work function to the threshold frequency or wavelength using φ = hf₀.

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Question 1

The work function of magnesium is 3.7 eV. Calculate the threshold frequency for photoelectric emission from magnesium. Use h = 6.63×10−346.63 \times 10^{-34} J s and e = 1.60×10−191.60 \times 10^{-19} C. Give your answer to 3 significant figures.

Hz

You can type 4.53, 3.2e-5, 3.2 × 10^-5 or 7/3.

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