Defining Potential Difference A cell makes one end of the circuit positive and the other negative. This sets up a potential difference (d) across the circuit The potential difference across a compo...
Calculating Electric Charge Current can also be defined as the charge passing through a circuit per unit time Electric charge is measured in units of coulombs (C) Charge, current and time are relat...
Defining Electric Current Electric current is the flow of charge carriers and is measured in units of amperes (A) or amps Charge can be either positive or negative When two oppositely charged condu...
The Grating Equation A diffraction grating is a plate on which there is a very large number of parallel, identical, close-spaced slits When monochromatic light is incident on a grating, a pattern o...
Double Slit Interference Young’s double slit experiment demonstrates how light waves produced an interference pattern The experiment is shown below Young’s double-slit experiment arrangement When a...
Demonstrating Two Source Interference Interference of sound, light and microwaves can be demonstrated with slits or diffraction gratings Using Water Waves Two-source interference in can be demonstr...
Interference & Coherence Interference occurs when waves overlap and their resultant displacement is the sum of the displacement of each wave This result is based on the principle of superpositi...
What is Diffraction? Diffraction is the spreading out of waves when they pass an obstruction This obstruction is typically a narrow slit (an aperture) The extent of diffraction depends on the width...
Stationary Waves Stationary waves, or standing waves, are produced by the superposition of two waves of the same frequency and amplitude travelling in opposite directions This is usually achieved b...
