Question 9

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

Question 7

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