White light consisting of wavelengths 380 nm $\le$ $\lambda$ $\le$ 750 nm is incident on a lead surface. For which one of the following ranges of wavelengths will photoelectrons be emitted from the lead surface that has a work function W₀ = 6.63 × 10^-¹⁹ J? A)380 nm $\le$ $\lambda$ $\le$ 750 nm B)380 nm $\le$ $\lambda$ $\le$ 630 nm C)380 nm $\le$ $\lambda$ $\le$ 540 nm D)380 nm $\le$ $\lambda$ $\le$ 410 nm E)No photoelectrons will be emitted.

Question

Quizplus · Accepted Answer

The energy of the photons must be greater than the work function to emit photoelectrons. The maximum energy of photons in the given range (750 nm) is less than the work function of lead, so no photoelectrons will be emitted.

White Light Consisting of Wavelengths 380 Nm ≤\le≤ λ\lambdaλ ≤\le≤ 750 Nm Is Incident on a Lead Surface

White Light Consisting of Wavelengths 380 Nm $\le$ $\lambda$ $\le$ 750 Nm Is Incident on a Lead Surface