As a wave strikes against a wall:(a) its phase changes by 180°, but v

1.	As a wave strikes against a wall:(a) its phase changes by 180°, but velocity does not change(b) its phase does not change, but velocity changes(c) its velocity changes and phase two changes by 180°(d) nothing can be predicted about changes in its velocity and phaseAnyone?
Answer» I think option (C) but I am not SURE....

As a wave strikes against a wall:(a) its phase changes by 180°, but velocity does not change(b) its phase does not change, but velocity changes(c) its velocity changes and phase two changes by 180°(d) nothing can be predicted about changes in its velocity and phaseAnyone?

Answer»

I think option (C)

but I am not SURE....

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As a wave strikes against a wall:(a) its phase changes by 180°, but velocity does not change(b) its phase does not change, but velocity changes(c) its velocity changes and phase two changes by 180°(d) nothing can be predicted about changes in its velocity and phaseAnyone?​

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As a wave strikes against a wall:(a) its phase changes by 180°, but velocity does not change(b) its phase does not change, but velocity changes(c) its velocity changes and phase two changes by 180°(d) nothing can be predicted about changes in its velocity and phaseAnyone?