The Work Function of a Particular Metal Is $4.20 \times 10 ^ { - 19 } \mathrm {~J}$

question 3

Multiple Choice

The work function of a particular metal is $4.20 \times 10 ^ { - 19 } \mathrm {~J}$ What is the photoelectric cutoff (threshold) wavelength for this metal? (c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

• A) 473 nm
• B) 308 nm
• C) 393 nm
• D) 554 nm

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