Refer to Circuits A and B below and answer the questions that follow. 11.1 Define the term emf. (2) 11.2 Calculate the total resistance of Circuit A. (2) 11.3 Consider Circuit B. 11.3.1 Write down the reading on A2. (1) 11.3.2 Calculate the reading on V1. (3) 11.4 If a third resistor (1,5 Ω) is … Read more
A neutral plastic ruler becomes charged when it is rubbed with a woollen cloth. After rubbing, the ruler has a charge of -3,5 x 10-15 C. 10.1 Distinguish between a neutral object and a charged object. (2) 10.2 Does the ruler GAIN or LOSE electrons? (1) 10.3 Calculate the number of electrons transferred during the … Read more
Two magnets are placed so that their north poles face each other. 9.1 Explain the term magnetic field. (2) 9.2 Draw the magnetic field pattern between the two north poles of the magnets. (3) 9.3 The graph below shows how the magnetic force varies with distance between the magnets. 9.3.1 What is the mathematical relationship … Read more
Consider a laser pointer and cellphone, as shown below. 8.1 State the type of electromagnetic radiation that is emitted by the: 8.1.1 Laser pointer (1) 8.1.2 Cellphone (1) 8.2 A laser pointer uses red light photons with a wavelength of 620 nm. 8.2.1 Define the term photon. (2) 8.2.2 Calculate the energy of a red … Read more
Dolphins communicate through the emission and reception of sounds. A young dolphin was separated from its mother and started whistling at a frequency of 130 kHz to call her. The speed of sound in seawater is 1480m∙s-1. 7.1 Explain the term ultrasound. (2) 7.2 Calculate the wavelength of the young dolphin’s whistle. (4) 7.3 Another … Read more
Two girls, standing at opposite ends of a rope, each makes a pulse of the same speed. Pulse A, with an amplitude of 4 cm, moves to the right and pulse B, with an amplitude of -6 cm, moves to the left. The pulses meet at point C. 6.1 State the phenomenon observed when the … Read more