In a photoelectric effect experiment, monochromatic ultraviolet radiation is incident on a metal surface with a work function of 2.2 eV2.2\text{ eV}2.2 eV. The stopping potential required to reduce the photoelectric current to zero is measured to be 1.5 V.
The intensity of the incident radiation is doubled while its frequency is kept constant.
What is the stopping potential now?
0.75 V0.75\text{ V}0.75 V
1.5 V1.5\text{ V}1.5 V
3.0 V3.0\text{ V}3.0 V
5.2 V5.2\text{ V}5.2 V
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.