When It Is Struck by 240-Nm Photons,a Material Having a Work

question 21

Multiple Choice

When it is struck by 240-nm photons,a material having a work function of 2.60 eV emits electrons.What is the maximum kinetic energy of the emitted electrons? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

• A)2.58 eV
• B)5.18 eV
• C)2.00 eV
• D)4.21 eV

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