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

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