Question

1. A property of spherical wave fronts is:

1. They interact with one another to always produce positive amplitude reinforcement.
2. They interact with one another to always produce negative amplitude cancellation.
3. They propagate radially outward from a center source in concentric circles.
4. They always travel at the speed of light.

Answer 1

ANSWER: C) THEY PROPAGATE RADIALLY OUTWARD FROM A CENTER SOURCE IN CONCENTRIC CIRCLES.

EXPLANATION:

A wavefront can be defined as a continuous locus of particles vibrating in the same phase. A ray drawn perpendicular to the wavefronts gives the direction of the propagation of the wave.

Now there are 3 types of wavefronts: Spherical, cylindrical and plane wavefront.

A Spherical wavefront is formed when a wave is produced from a point source and propagate radially in all the direction. Here we can find CONCENTRIC circles of wavefronts with the point source as the center.

It is important to note that the wavefronts are disturbances in the medium which travels with same speed as the speed of sound ​​​​​​, not speed of light.

And the waves are concentric, hence don't interact with each other. It requires at least of 2 different sources to produce an interference.

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