Physics Past Questions and Answers

State three different materials that can be used to demonstrate Brownian motion.

An electron enters perpendicularly into a uniform magnetic field which has a flux density of 0.12 T This results in a magnetic force of 9.6 x 10\(^{-2}\) N on the electron. Calculate the speed of the electron as it enters the magnetic field. (e =1.6 x \(10^{19}\) C)

List three uses of rockets.

(a) What is doping?
(b) Explain how doping improves the conductivity of a semiconductor

The diagram above illustrates a cathode ray tube. Identify the components X, Y, and Z.