In post 16.25, we saw that an electric charge produces an electric field. If the charge oscillates, relative to an observer, then the field will oscillate. We also saw that a moving electrical charge produces a magnetic field. If this movement is oscillatory, the magnetic field will be oscillatory. The fields can have an influence… Continue reading 19.9 Electromagnetic waves

Before you read this, I suggest you read posts 16.21 and 18.10. The picture shows a sinusoidal water wave (in blue) of amplitude A and wavelength λ (post 18.10) travelling along a straight channel at an instant in time, t. The wave is formed by water in the layer between the lines (that lie in… Continue reading 19.8 Wave energy

Before you read this, I suggest that you read posts 19.5 and 19.6. In post 19.5, we saw that positive charges move spontaneously from hydrogen ions (H+) to zinc atoms because a zinc atom is at a lower electrical potential (post 17.44) than a hydrogen atom. As a result, a zinc atom is converted into… Continue reading 19.7 Redox potentials