Constructive and destructive interference and Young’s Slits experiment
Progressive waves are waves that travel from one place to another. A good example of this is sound as we usually hear it and all of the waves in the electromagnetic spectrum such as light.
This video lesson sets out to explain the constructive and destructive interference between two sources of progressive waves. Showing what happens and why that happens. The main demonstration you will see uses water waves. That is because it is easy to see them and what happens when they meet. The lesson then moves on to demonstrate the same idea with visible red light, confirming that light has wave like properties. Finally quickly explaining how the measurements on the interference pattern can be used to calculate the wavelength. The level is aimed at 14 to 16 year old physics syllabuses but would be useful revision for older students.
On flash drive there are a large number of video lessons including many more on progressive waves. Details are here.
A major class of progressive waves is the electromagnetic spectrum. The waves within the spectrum have several major properties in common, that is why they are linked together. However each section has peculiar and useful properties of its' own. You can view this example video about the Electromagnetic Spectrum for free on the Curious streaming service here.