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

question 5

Multiple Choice

Platinum, which is widely used as a catalyst, has a work function $\phi$ (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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