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

question 5

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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