A photon of wavelength 300 nm strikes a metal surface, and the ejected electron has a kinetic energy of 2.0 × 10⁻¹⁹ J. W

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A photon of wavelength 300 nm strikes a metal surface, and the ejected electron has a kinetic energy of 2.0 × 10⁻¹⁹ J. What is the work function of the metal? (h = 6.626 × 10⁻³⁴ J s, c = 3.0 × 10⁸ m s⁻¹)

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2.0 × 10⁻¹⁹ J 6.626 × 10⁻¹⁹ J 3.313 × 10⁻¹⁹ J 4.626 × 10⁻¹⁹ J Correct

E = hc/λ = 6.626×10⁻¹⁹ J. W₀ = E - KE = 4.626×10⁻¹⁹ J.

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