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

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