Platinum, Which Is Widely Used as a Catalyst, Has a Work

question 14

Multiple Choice

Platinum, which is widely used as a catalyst, has a work function (the minimum energy needed to eject an electron from the metal surface) of 9.05 × 10-¹⁹ J. What is the longest wavelength of light which will cause electrons to be emitted?

• A) 2.196 × 10^-7 m
• B) 4.553 × 10^-6 m
• C) 5.654 × 10² m
• D) 1.370 × 10¹⁵ m
• E) > 10⁶ m

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