Aruba Landsexamen VWO Practice Questions - Aruba Landsexamen VWO (Pre-University State Examination) Exam

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In the photoelectric effect (foto-elektrisch effect), monochromatic light of frequency f shines on a metal surface with work function W. If the frequency of the incident light is doubled while keeping its intensity constant, what happens to the maximum kinetic energy (E_k,max) of the ejected photoelectrons?

E_k,max remains exactly unchanged. E_k,max more than doubles, because E_k,max = h*f - W and the newly available energy (2*h*f - W) exceeds 2*(h*f - W). E_k,max is halved. The number of ejected electrons per second doubles while their kinetic energy remains zero.

Correct Answer:

E_k,max more than doubles, because E_k,max = h*f - W and the newly available energy (2*h*f - W) exceeds 2*(h*f - W).

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