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

question 44

Multiple Choice

Platinum, which is widely used as a catalyst, has a work functionΦ (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 × 10 ² m
• D)1.370 × 10 ¹⁵ m
• E)> 10 ⁶ m

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