What Is the Critical Wavelength of an Incoming Light That

question 2

Multiple Choice

What is the critical wavelength of an incoming light that ejects electrons from a metal whose work function is E_A = 5.02 eV? [h = 6.63 × 10^-34 J s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10^-19 J]

• A)39 nm
• B)64 nm
• C)120 nm
• D)250 nm

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