The graph shows a snapshot of a travelling harmonic wave; eight points are indic

Question

The graph shows a snapshot of a travelling harmonic wave; eight points are indicated. Answer the five questions by selecting from the choices below. E.g., if the answer to the first question is A, and the answers to the rest, B, enter ABBBB. You only have three tries!

If the wave is moving to the right, what is the direction of the velocity of the particle at point 6?

If the wave is moving to the left, what is the direction of the velocity of the particle at point 5?

If the velocity of the particle at point 6 is given by the arrow B, in which direction is the wave moving?

If the velocity of the particle at point 1 is given by the arrow C, in which direction is the wave moving?

If the wave is moving in the direction A, what is the direction of the velocity of the particle at point 7?

Explanation / Answer

(a) upward direction

(b) downward direction

(c) right direction

(d) left direction

(e) at point 7 the velocity of particle is zero.

now let me explain one by one, particles can only oscillate in up and down direction. for example if the wave is moving in right direction the particle at 6 will have to up to remain in the harmonic wave form. you can understand it like this, draw the wave on a piece of paper and put your pencil tip at point 6, now move this wave or paper in right direction. You can move your pencil tip in up and down direction, now see if you have to be in the wave, which direction your pencil tip or to say particle at that point should move. You can use this method in rest of the options. In last part the particle 7 is at extreme point there for in whichever direction the wave is moving it has to come to rest at point 7.

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