Which of the following statements about wave is not correct? i. A wavefront is a line which contains all particles whose vibration are in phase. ii. The direction of propagation of a wave is the link drawn parallel to the wavefront. iii. A wavefront is a circle which is common to particles that are in the same state of disturbance
i only
ii only
i and ii only
i and iii only
ii and iii only
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The answer should be B(ii only) because a wavefront can also be circular,as in water waves
Let's analyze each statement:
i. A wavefront is a line which contains all particles whose vibration are in phase.
This statement is correct because a wavefront is defined as a line (or surface) connecting points in a wave that have the same phase.
ii. The direction of propagation of a wave is the link drawn parallel to the wavefront.
This statement is incorrect. The direction of propagation of a wave is always perpendicular (normal) to the wavefront, not parallel.
iii. A wavefront is a circle which is common to particles that are in the same state of disturbance.
This statement is correct in the case of waves spreading out from a point source, creating circular wavefronts. In general, a wavefront is the locus of points having the same phase, not just a circle.
So B should be the answer
