Physics WPH01: Probing Matter Topical Past Paper Questions

The photograph shows the path of an electron beam in a fine beam tube. The fine beam tube contains helium gas at very low pressure. When electrons strike the helium atoms the resulting excitation is responsible for the glow tracing the path of the electron beam. The electron beam…

In the early 20th century, experiments were carried out in which high-speed alpha particles were directed at thin gold foil. A simplified version of the apparatus used is shown. (a) State two observations and corresponding conclusions made from the alpha particle scattering exper…

In the early 1900s Geiger and Marsden carried out experiments in which a beam of high speed alpha particles was directed at thin gold foil. The apparatus used is represented in the diagram. (a) Explain why the alpha source was placed in a lead box with a single small hole. (2) $…