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What are wave fronts?
(Physics) A wave front is an imaginary surface joining all points in space that are reached at the similar instant by a wave propagating by a medium.
Let's try some instance. When a rock is tossed into a calm lake, a surface disturbance radiates from the point where the rock broke the water. The leading edge of that whole wave forms a circle, and that circle is the wave front for that event. It is moving outward at a constant speed in all directions. In a burst of chemical energy, a star shell explodes at a fireworks display. The light moves away from the origin in all directions at the similar speed - the speed of light. And the 3D surface of this wave front is a sphere, and it is expands around the source at the speed of light. Pick an arbitrary distance, say, 1 kilometre. Anyone at a distance of 1 km from the event in any direction will search that the wave front reaches him at the similar instant of time as anyone else in any direction who is that 1 km from the event. Even someone in an airplane that is 1 km away will be on the wave front for an instant - that similar instant as any other observers 1 km away. Note that the sound will arrive later - but it, too, radiates forming a spherical wave front. Our observers at 1 km distance from the event all experience the arrival of the sound wave at the similar time.
Hookes Law Hooke's equation actually holds (to some extent) in several other situations whereas an elastic body is deformed, like as wind blowing on a tall building, a musician
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