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

Question

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

Quizplus · Accepted Answer

The longest wavelength of light that can cause electron emission is calculated using the equation λ = hc/Φ, where h is Planck's constant and c is the speed of light. Substituting the given work function, the longest wavelength is approximately 2.196 × 10⁻⁷ m.

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