Electromagnetic radiation is incident on a metal of work function 3.1 eV3.1\text{ eV}3.1 eV. The maximum kinetic energy (KE) of the photoelectrons is 1.4 eV1.4\text{ eV}1.4 eV.
The frequency of this incident electromagnetic radiation is kept the same but its intensity is tripled.
What is the maximum KE of the photoelectrons now?
1.4 eV1.4\text{ eV}1.4 eV
2.8 eV2.8\text{ eV}2.8 eV
4.2 eV4.2\text{ eV}4.2 eV
4.5 eV4.5\text{ eV}4.5 eV
26 exam-style questions on OCR A A Level Physics Quantum physics, covering Photons, The photoelectric effect, and Wave–particle duality. Each one has a worked solution and a mark scheme showing where the marks go.