A-level Physics · Photoelectric effect

Photoelectric maximum KE

Use hf = φ + E_k(max) with the work function in eV to find the most energetic electron's KE.

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Question 1

Ultraviolet radiation of wavelength 187 nm is incident on a clean calcium surface. The work function of calcium is 2.9 eV. Calculate the maximum kinetic energy of the emitted photoelectrons, in eV. Use h = 6.63×10−346.63 \times 10^{-34} J s, c = 3.00×1083.00 \times 10^{8} m s⁻¹ and e = 1.60×10−191.60 \times 10^{-19} C. Give your answer to 3 significant figures.

eV

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

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