CAPE Physics Unit 2 · 2007 · Paper 2 · Question 9(b)(i)
Ultraviolet radiation of wavelength 400 nm and intensity 100 W m⁻² illuminates an area of 5.0 × 10⁻⁶ m² of a metal photocell, producing a saturation photocurrent of 5 × 10⁻⁹ A with maximum photoelectron kinetic energy of 1.3 × 10⁻¹⁹ J.
Calculate the number of photons incident on the illuminated surface per second.
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