The diagram below shows an instantaneous position of a string as a transverse progressive wave travels along it from left to right Which one of the following correctly shows the direction of the velocity of the points 1,2 and 3 on the string?

Options

A. `{:(1,2,3),(rarr,rarr,rarr):}`
B. `{:(1,2,3),(rarr,larr,rarr):}`
C. `{:(1,2,3),(darr,darr,darr):}`
D. `{:(1,2,3),(darr,uarr,darr):}`

Answer

D

Explanation

Since,
Particle velocity = - (wave velocity) `xx` slope of the graph at that point
At point 1 : slope `rarr(+ve),v_(P)rarr(-ve)darr`
At point 2 : slope `rarr(-ve),|v_(P)rarr(+ve)uarr`
At point 3 : slope `rarr(+ve),v_(P)rarr(-ve)darr`.