When a Certain Metal Is Illuminated by Light,photoelectrons Are Observed

question 25

Multiple Choice

When a certain metal is illuminated by light,photoelectrons are observed provided that the wavelength of the light is less than 669 nm.Which one of the following values is closest to the work function of this metal? (h = 6.626 × 10^-34 J ∙ s,c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10^-19 J)

• A)1.9 eV
• B)2.0 eV
• C)2.2 eV
• D)2.3 eV