When It Is Struck By $240 - \mathrm { nm }$

question 9

Multiple Choice

When it is struck by $240 - \mathrm { nm }$ photons, a material having a work function of $2.60 \mathrm { eV }$ emits electrons. What is the maximum kinetic energy of the emitted electrons? ( $c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times$ $10 ^{- 34} \mathrm {~J} \cdot \mathrm { s } , 1 \mathrm { eV } = 1.60 \times 10 ^{- 19} \mathrm {~J}$ )

• A) \(4.21 \mathrm { eV }\)
• B) \(2.00 \mathrm { eV }\)
• C) \(2.58 \mathrm { eV }\)
• D) \(5.18 \mathrm { eV }\)

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Definitions:

Heterogeneous Catalysts

Catalysts that exist in a different phase than the reactants in a chemical reaction, facilitating the reaction without being consumed.

Chromatographically

Pertaining to chromatography, a method for separating components of a mixture based on differences in their movement through a stationary medium.

Filtration

A process used to separate solids from liquids or gases using a filter medium that allows the fluid to pass but not the solid.

Zero-Order Reaction

A chemical reaction whose rate is independent of the concentration of the reactant(s).