13. A small vibrating object S moves across the surface of a tank of water produ

Question

13. A small vibrating object S moves across the surface of a tank of water producing the wave fronts shown in the figure below. The wave fronts move with speed v.

The object is traveling in what direction and with what speed relative to the speed of the waves?

A) Direction: To the right                                  Speed:   Greater than v

B) Direction: To the left                                     Speed:   Greater than v

C) Direction: To the left                                     Speed:    Equal to v

D) Direction: To the left                                    Speed:    Less than v

E) Direction: To the right                                  Speed:   Less than v

13. A small vibrating object S moves across the surface of a tank of water producing the wave fronts shown in the figure below. The wave fronts move with speed v. The object is traveling in what direction and with what speed relative to the speed of the waves? A) Direction: To the right Speed: Greater than v B) Direction: To the left Speed: Greater than v C) Direction: To the left Speed: Equal to v D) Direction: To the left Speed: Less than v E) Direction: To the right Speed: Less than v

Explanation / Answer

The object is travlling right with speed less than v : option E

to find the direction we look for smaller wavefronts : which are sources.Since wavefronts have become smaller to larger from left to right it shows that the wave is moving from left to right

Also the speed of wave propagation is faster than the speed of particle(as matter is not transported)

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