11.1 A teacher in a science class explains how different types of spectra are obtained. The teacher uses the simplified diagrams shown below for the explanation. Name the type of spectrum of: 11.1.1 Y (1) 11.1.2 Z (1) 11.2 In an excited atom, electrons can ‘jump’ from lower energy levels to higher energy levels. They … Read more
In an experiment to demonstrate the photoelectric effect, light of different wavelengths was shone onto a metal surface of a photoelectric cell. The maximum kinetic energy of the emitted electrons was determined for the various wavelengths and recorded in the table below. 11.1 What is meant by the term photoelectric effect? (2) 11.2 Draw a … Read more
11.1 The circuit below is used to determine the resistance of resistor X. The 12 V battery has negligible internal resistance. When switch S is closed,the reading on the ammeter is 0,5 A. 11.1.1 State Ohm’s law in words. (2) 11.1.2 Calculate the resistance of resistor X. (5) 11.2 Study the circuit below. The battery … Read more
In the diagram below, O is the centre of the circle. CDE is a tangent to the circle at D. 11.1 Prove that BC ∥ OD. (4) [7]
11.1 The Venn-diagram below shows two independent events, M and N. Determine the values of probabilities x and y. Show all calculations.(5) 11.2 The following contingency table shows information on the drivers’ tests of 100 drivers tested at a test centre in Port Elizabeth. A driver is randomly selected from the 100 drivers. 11.2.1 Determine … Read more